docs: examples moved to docs website

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* [Usage](#usage) * [Usage](#usage)
* [Git context](#git-context) * [Git context](#git-context)
* [Path context](#path-context) * [Path context](#path-context)
* [Advanced usage](#advanced-usage) * [Examples](#examples)
* [Multi-platform image](docs/advanced/multi-platform.md)
* [Secrets](docs/advanced/secrets.md)
* [Isolated builders](docs/advanced/isolated-builders.md)
* [Push to multi-registries](docs/advanced/push-multi-registries.md)
* [Copy between registries](docs/advanced/copy-between-registries.md)
* [Cache](docs/advanced/cache.md)
* [Local registry](docs/advanced/local-registry.md)
* [Export image to Docker](docs/advanced/export-docker.md)
* [Share built image between jobs](docs/advanced/share-image-jobs.md)
* [Test your image before pushing it](docs/advanced/test-before-push.md)
* [Named contexts](docs/advanced/named-contexts.md)
* [Handle tags and labels](docs/advanced/tags-labels.md)
* [Update Docker Hub repo description](docs/advanced/dockerhub-desc.md)
* [Customizing](#customizing) * [Customizing](#customizing)
* [inputs](#inputs) * [inputs](#inputs)
* [outputs](#outputs) * [outputs](#outputs)
@ -129,8 +116,8 @@ to the default Git context:
Building from the current repository automatically uses the [GitHub Token](https://docs.github.com/en/actions/security-guides/automatic-token-authentication), Building from the current repository automatically uses the [GitHub Token](https://docs.github.com/en/actions/security-guides/automatic-token-authentication),
so it does not need to be passed. If you want to authenticate against another so it does not need to be passed. If you want to authenticate against another
private repository, you have to use a [secret](docs/advanced/secrets.md) named private repository, you have to use a [secret](https://docs.docker.com/build/ci/github-actions/examples/#secrets)
`GIT_AUTH_TOKEN` to be able to authenticate against it with Buildx: named `GIT_AUTH_TOKEN` to be able to authenticate against it with Buildx:
```yaml ```yaml
- -
@ -181,21 +168,9 @@ jobs:
tags: user/app:latest tags: user/app:latest
``` ```
## Advanced usage ## Examples
* [Multi-platform image](docs/advanced/multi-platform.md) See https://docs.docker.com/build/ci/github-actions/examples/.
* [Secrets](docs/advanced/secrets.md)
* [Isolated builders](docs/advanced/isolated-builders.md)
* [Push to multi-registries](docs/advanced/push-multi-registries.md)
* [Copy between registries](docs/advanced/copy-between-registries.md)
* [Cache](docs/advanced/cache.md)
* [Local registry](docs/advanced/local-registry.md)
* [Export image to Docker](docs/advanced/export-docker.md)
* [Share built image between jobs](docs/advanced/share-image-jobs.md)
* [Test your image before pushing it](docs/advanced/test-before-push.md)
* [Named contexts](docs/advanced/named-contexts.md)
* [Handle tags and labels](docs/advanced/tags-labels.md)
* [Update Docker Hub repo description](docs/advanced/dockerhub-desc.md)
## Customizing ## Customizing

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# Cache # Cache
* [Inline cache](#inline-cache) This page has moved to [Docker Docs website](https://docs.docker.com/build/ci/github-actions/examples/#cache)
* [Registry cache](#registry-cache)
* [GitHub cache](#github-cache)
* [Cache backend API](#cache-backend-api)
* [Local cache](#local-cache)
> **Note**
>
> See [our guide](https://github.com/docker/buildx/blob/master/docs/guides/cache/index.md)
> for more details about cache storage backends.
## Inline cache
In most cases you want to use the [`type=inline` cache exporter](https://github.com/docker/buildx/blob/master/docs/guides/cache/inline.md).
However, note that the `inline` cache exporter only supports `min` cache mode. To enable `max` cache mode, push the
image and the cache separately by using the `registry` cache exporter as shown in the [next example](#registry-cache).
```yaml
name: ci
on:
push:
branches:
- 'main'
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v3
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
-
name: Login to Docker Hub
uses: docker/login-action@v2
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
-
name: Build and push
uses: docker/build-push-action@v3
with:
context: .
push: true
tags: user/app:latest
cache-from: type=registry,ref=user/app:latest
cache-to: type=inline
```
## Registry cache
You can import/export cache from a cache manifest or (special) image configuration on the registry with the
[`type=registry` cache exporter](https://github.com/docker/buildx/blob/master/docs/guides/cache/registry.md).
```yaml
name: ci
on:
push:
branches:
- 'main'
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v3
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
-
name: Login to Docker Hub
uses: docker/login-action@v2
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
-
name: Build and push
uses: docker/build-push-action@v3
with:
context: .
push: true
tags: user/app:latest
cache-from: type=registry,ref=user/app:buildcache
cache-to: type=registry,ref=user/app:buildcache,mode=max
```
## GitHub cache
### Cache backend API
> **Warning**
>
> This cache exporter is considered EXPERIMENTAL until further notice. Please
> provide feedback on [BuildKit repository](https://github.com/moby/buildkit)
> if you encounter any issues.
[GitHub Actions cache exporter](https://github.com/docker/buildx/blob/master/docs/guides/cache/gha.md)
backend uses the [GitHub Cache API](https://github.com/tonistiigi/go-actions-cache/blob/master/api.md)
to fetch and upload cache blobs. That's why this type of cache should be
exclusively used in a GitHub Action workflow as the `url` (`$ACTIONS_CACHE_URL`)
and `token` (`$ACTIONS_RUNTIME_TOKEN`) attributes are populated when a workflow
is started.
```yaml
name: ci
on:
push:
branches:
- 'main'
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v3
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
-
name: Login to Docker Hub
uses: docker/login-action@v2
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
-
name: Build and push
uses: docker/build-push-action@v3
with:
context: .
push: true
tags: user/app:latest
cache-from: type=gha
cache-to: type=gha,mode=max
```
### Local cache
> **Warning**
>
> At the moment caches are copied over the existing cache, so it [keeps growing](https://github.com/docker/build-push-action/issues/252).
> The `Move cache` step is used as a workaround (see [moby/buildkit#1896](https://github.com/moby/buildkit/issues/1896) for more info).
You can also leverage [GitHub cache](https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows)
using the [actions/cache](https://github.com/actions/cache) and [`type=local` cache exporter](https://github.com/docker/buildx/blob/master/docs/guides/cache/local.md)
with this action:
```yaml
name: ci
on:
push:
branches:
- 'main'
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v3
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
-
name: Cache Docker layers
uses: actions/cache@v3
with:
path: /tmp/.buildx-cache
key: ${{ runner.os }}-buildx-${{ github.sha }}
restore-keys: |
${{ runner.os }}-buildx-
-
name: Login to Docker Hub
uses: docker/login-action@v2
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
-
name: Build and push
uses: docker/build-push-action@v3
with:
context: .
push: true
tags: user/app:latest
cache-from: type=local,src=/tmp/.buildx-cache
cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
-
# Temp fix
# https://github.com/docker/build-push-action/issues/252
# https://github.com/moby/buildkit/issues/1896
name: Move cache
run: |
rm -rf /tmp/.buildx-cache
mv /tmp/.buildx-cache-new /tmp/.buildx-cache
```

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# Copy images between registries # Copy images between registries
[Multi-platform images](https://docs.docker.com/build/building/multi-platform/) This page has moved to [Docker Docs website](https://docs.docker.com/build/ci/github-actions/examples/#copy-images-between-registries)
built using Buildx can be copied from one registry to another using the
[`imagetools create` command](https://docs.docker.com/engine/reference/commandline/buildx_imagetools_create/):
```yaml
name: ci
on:
push:
branches:
- 'main'
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v3
-
name: Set up QEMU
uses: docker/setup-qemu-action@v2
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
-
name: Login to Docker Hub
uses: docker/login-action@v2
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
-
name: Login to GitHub Container Registry
uses: docker/login-action@v2
with:
registry: ghcr.io
username: ${{ github.repository_owner }}
password: ${{ secrets.GITHUB_TOKEN }}
-
name: Build and push
uses: docker/build-push-action@v3
with:
context: .
platforms: linux/amd64,linux/arm64
push: true
tags: |
user/app:latest
user/app:1.0.0
-
name: Push image to GHCR
run: |
docker buildx imagetools create \
--tag ghcr.io/user/app:latest \
--tag ghcr.io/user/app:1.0.0 \
user/app:latest
```

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# Update Docker Hub repo description # Update Docker Hub repo description
You can update the [Docker Hub repository description](https://docs.docker.com/docker-hub/repos/) This page has moved to [Docker Docs website](https://docs.docker.com/build/ci/github-actions/examples/#update-docker-hub-repository-description)
using a third party action called [Docker Hub Description](https://github.com/peter-evans/dockerhub-description)
with this action:
```yaml
name: ci
on:
push:
branches:
- 'main'
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v3
-
name: Set up QEMU
uses: docker/setup-qemu-action@v2
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
-
name: Login to Docker Hub
uses: docker/login-action@v2
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
-
name: Build and push
uses: docker/build-push-action@v3
with:
context: .
push: true
tags: user/app:latest
-
name: Update repo description
uses: peter-evans/dockerhub-description@v2
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_PASSWORD }}
repository: user/app
```

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# Export image to Docker # Export image to Docker
You may want your build result to be available in the Docker client through This page has moved to [Docker Docs website](https://docs.docker.com/build/ci/github-actions/examples/#export-image-to-docker)
`docker images` to be able to use it in another step of your workflow:
```yaml
name: ci
on:
push:
branches:
- 'main'
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v3
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
-
name: Build
uses: docker/build-push-action@v3
with:
context: .
load: true
tags: myimage:latest
-
name: Inspect
run: |
docker image inspect myimage:latest
```

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# Isolated builders # Isolated builders
```yaml This page has moved to [Docker Docs website](https://docs.docker.com/build/ci/github-actions/examples/#isolated-builders)
name: ci
on:
push:
branches:
- 'main'
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v3
-
uses: docker/setup-buildx-action@v2
id: builder1
-
uses: docker/setup-buildx-action@v2
id: builder2
-
name: Builder 1 name
run: echo ${{ steps.builder1.outputs.name }}
-
name: Builder 2 name
run: echo ${{ steps.builder2.outputs.name }}
-
name: Build against builder1
uses: docker/build-push-action@v3
with:
builder: ${{ steps.builder1.outputs.name }}
context: .
target: mytarget1
-
name: Build against builder2
uses: docker/build-push-action@v3
with:
builder: ${{ steps.builder2.outputs.name }}
context: .
target: mytarget2
```

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# Local registry # Local registry
For testing purposes you may need to create a [local registry](https://hub.docker.com/_/registry) This page has moved to [Docker Docs website](https://docs.docker.com/build/ci/github-actions/examples/#local-registry)
to push images into:
```yaml
name: ci
on:
push:
branches:
- 'main'
jobs:
docker:
runs-on: ubuntu-latest
services:
registry:
image: registry:2
ports:
- 5000:5000
steps:
-
name: Checkout
uses: actions/checkout@v3
-
name: Set up QEMU
uses: docker/setup-qemu-action@v2
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
with:
driver-opts: network=host
-
name: Build and push to local registry
uses: docker/build-push-action@v3
with:
context: .
push: true
tags: localhost:5000/name/app:latest
-
name: Inspect
run: |
docker buildx imagetools inspect localhost:5000/name/app:latest
```

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# Multi-platform image # Multi-platform image
You can build [multi-platform images](https://docs.docker.com/build/building/multi-platform/) This page has moved to [Docker Docs website](https://docs.docker.com/build/ci/github-actions/examples/#multi-platform-images)
using the [`platforms` input](../../README.md#inputs) as described below.
> **Note**
>
> * List of available platforms will be displayed and available through our
> [setup-buildx](https://github.com/docker/setup-buildx-action#about) action.
> * If you want support for more platforms, you can use QEMU with our
> [setup-qemu](https://github.com/docker/setup-qemu-action) action.
```yaml
name: ci
on:
push:
branches:
- 'main'
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v3
-
name: Set up QEMU
uses: docker/setup-qemu-action@v2
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
-
name: Login to Docker Hub
uses: docker/login-action@v2
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
-
name: Build and push
uses: docker/build-push-action@v3
with:
context: .
platforms: linux/amd64,linux/arm64
push: true
tags: user/app:latest
```

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# Named contexts # Named contexts
You can define [additional build contexts](https://docs.docker.com/engine/reference/commandline/buildx_build/#build-context) This page has moved to [Docker Docs website](https://docs.docker.com/build/ci/github-actions/examples/#named-contexts)
that can be accessed in your Dockerfile with `FROM name` or `--from=name`. When
Dockerfile defines a stage with the same name it is overwritten.
This can be useful with GitHub Actions to reuse results from other builds or
pin an image to a spcific tag in your workflow.
* [Pin image to a specific tag](#pin-image-to-a-specific-tag)
* [Usage of the built image in other build steps](#usage-of-the-built-image-in-other-build-steps)
## Pin image to a specific tag
Replace `alpine:latest` with a pinned one:
```dockerfile
# syntax=docker/dockerfile:1
FROM alpine
RUN echo "Hello World"
```
```yaml
name: ci
on:
push:
branches:
- 'main'
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v3
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
-
name: Build
uses: docker/build-push-action@v3
with:
context: .
build-contexts: |
alpine=docker-image://alpine:3.16
tags: myimage:latest
```
## Usage of the built image in other build steps
By default, the [`setup-buildx` action](https://github.com/docker/setup-buildx-action#about)
uses `docker-container` as a build driver, so built Docker images are not
available in the builder container.
With named contexts you can reuse the built image:
```dockerfile
# syntax=docker/dockerfile:1
FROM alpine
RUN echo "Hello World"
```
```yaml
name: ci
on:
push:
branches:
- 'main'
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v3
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
-
name: Build base image
uses: docker/build-push-action@v3
with:
context: base
load: true
tags: my-base-image:latest
-
name: Build
uses: docker/build-push-action@v3
with:
context: .
build-contexts: |
alpine=docker-image://my-base-image:latest
tags: myimage:latest
```

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# Push to multi-registries # Push to multi-registries
The following workflow will connect you to [Docker Hub](https://github.com/docker/login-action#dockerhub) This page has moved to [Docker Docs website](https://docs.docker.com/build/ci/github-actions/examples/#push-to-multi-registries)
and [GitHub Container Registry](https://github.com/docker/login-action#github-container-registry)
and push the image to these registries:
```yaml
name: ci
on:
push:
branches:
- 'main'
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v3
-
name: Set up QEMU
uses: docker/setup-qemu-action@v2
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
-
name: Login to Docker Hub
uses: docker/login-action@v2
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
-
name: Login to GitHub Container Registry
uses: docker/login-action@v2
with:
registry: ghcr.io
username: ${{ github.repository_owner }}
password: ${{ secrets.GITHUB_TOKEN }}
-
name: Build and push
uses: docker/build-push-action@v3
with:
context: .
platforms: linux/amd64,linux/arm64
push: true
tags: |
user/app:latest
user/app:1.0.0
ghcr.io/user/app:latest
ghcr.io/user/app:1.0.0
```

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@ -1,88 +1,3 @@
# Secrets # Secrets
In the following example we will expose and use the [GITHUB_TOKEN secret](https://docs.github.com/en/actions/security-guides/automatic-token-authentication#about-the-github_token-secret) This page has moved to [Docker Docs website](https://docs.docker.com/build/ci/github-actions/examples/#secrets)
as provided by GitHub in your workflow.
First let's create our `Dockerfile` to use our secret:
```dockerfile
# syntax=docker/dockerfile:1
FROM alpine
RUN --mount=type=secret,id=github_token \
cat /run/secrets/github_token
```
As you can see we have named our secret `github_token`. Here is the workflow
you can use to expose this secret using the [`secrets` input](../../README.md#inputs):
```yaml
name: ci
on:
push:
branches:
- 'main'
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v3
-
name: Set up QEMU
uses: docker/setup-qemu-action@v2
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
-
name: Build
uses: docker/build-push-action@v3
with:
context: .
platforms: linux/amd64,linux/arm64
tags: user/app:latest
secrets: |
"github_token=${{ secrets.GITHUB_TOKEN }}"
```
> **Note**
>
> You can also expose a secret file to the build with the [`secret-files`](../../README.md#inputs) input:
> ```yaml
> secret-files: |
> "MY_SECRET=./secret.txt"
> ```
If you're using [GitHub secrets](https://docs.github.com/en/actions/security-guides/encrypted-secrets)
and need to handle multi-line value, you will need to place the key-value pair
between quotes:
```yaml
secrets: |
"MYSECRET=${{ secrets.GPG_KEY }}"
GIT_AUTH_TOKEN=abcdefghi,jklmno=0123456789
"MYSECRET=aaaaaaaa
bbbbbbb
ccccccccc"
FOO=bar
"EMPTYLINE=aaaa
bbbb
ccc"
"JSON_SECRET={""key1"":""value1"",""key2"":""value2""}"
```
| Key | Value |
|--------------------|-------------------------------------|
| `MYSECRET` | `***********************` |
| `GIT_AUTH_TOKEN` | `abcdefghi,jklmno=0123456789` |
| `MYSECRET` | `aaaaaaaa\nbbbbbbb\nccccccccc` |
| `FOO` | `bar` |
| `EMPTYLINE` | `aaaa\n\nbbbb\nccc` |
| `JSON_SECRET` | `{"key1":"value1","key2":"value2"}` |
> **Note**
>
> All quote signs need to be doubled for escaping.

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@ -1,60 +1,3 @@
# Share built image between jobs # Share built image between jobs
As each job is isolated in its own runner you cannot use your built image This page has moved to [Docker Docs website](https://docs.docker.com/build/ci/github-actions/examples/#share-built-image-between-jobs)
between jobs (except for [self-hosted runners](https://docs.github.com/en/actions/hosting-your-own-runners/about-self-hosted-runners)).
However, you can [pass data between jobs in a workflow](https://docs.github.com/en/actions/using-workflows/storing-workflow-data-as-artifacts#passing-data-between-jobs-in-a-workflow)
using the [actions/upload-artifact](https://github.com/actions/upload-artifact)
and [actions/download-artifact](https://github.com/actions/download-artifact)
actions:
```yaml
name: ci
on:
push:
branches:
- 'main'
jobs:
build:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v3
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
-
name: Build and export
uses: docker/build-push-action@v3
with:
context: .
tags: myimage:latest
outputs: type=docker,dest=/tmp/myimage.tar
-
name: Upload artifact
uses: actions/upload-artifact@v3
with:
name: myimage
path: /tmp/myimage.tar
use:
runs-on: ubuntu-latest
needs: build
steps:
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
-
name: Download artifact
uses: actions/download-artifact@v3
with:
name: myimage
path: /tmp
-
name: Load image
run: |
docker load --input /tmp/myimage.tar
docker image ls -a
```

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@ -1,77 +1,3 @@
# Handle tags and labels # Handle tags and labels
If you want an "automatic" tag management and [OCI Image Format Specification](https://github.com/opencontainers/image-spec/blob/master/annotations.md) This page has moved to [Docker Docs website](https://docs.docker.com/build/ci/github-actions/examples/#manage-tags-and-labels)
for labels, you can do it in a dedicated step. The following workflow will use
the [Docker metadata action](https://github.com/docker/metadata-action) to
handle tags and labels based on GitHub actions events and Git metadata:
```yaml
name: ci
on:
schedule:
- cron: '0 10 * * *'
push:
branches:
- '**'
tags:
- 'v*.*.*'
pull_request:
branches:
- 'main'
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v3
-
name: Docker meta
id: meta
uses: docker/metadata-action@v4
with:
# list of Docker images to use as base name for tags
images: |
name/app
ghcr.io/username/app
# generate Docker tags based on the following events/attributes
tags: |
type=schedule
type=ref,event=branch
type=ref,event=pr
type=semver,pattern={{version}}
type=semver,pattern={{major}}.{{minor}}
type=semver,pattern={{major}}
type=sha
-
name: Set up QEMU
uses: docker/setup-qemu-action@v2
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
-
name: Login to Docker Hub
if: github.event_name != 'pull_request'
uses: docker/login-action@v2
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
-
name: Login to GHCR
if: github.event_name != 'pull_request'
uses: docker/login-action@v2
with:
registry: ghcr.io
username: ${{ github.repository_owner }}
password: ${{ secrets.GITHUB_TOKEN }}
-
name: Build and push
uses: docker/build-push-action@v3
with:
context: .
push: ${{ github.event_name != 'pull_request' }}
tags: ${{ steps.meta.outputs.tags }}
labels: ${{ steps.meta.outputs.labels }}
```

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@ -1,67 +1,3 @@
# Test your image before pushing it # Test your image before pushing it
In some cases, you might want to validate that the image works as expected This page has moved to [Docker Docs website](https://docs.docker.com/build/ci/github-actions/examples/#test-your-image-before-pushing-it)
before pushing it.
The workflow below will be composed of several steps to achieve this:
* Build and export the image to Docker
* Test your image
* Multi-platform build and push the image
```yaml
name: ci
on:
push:
branches:
- 'main'
env:
TEST_TAG: user/app:test
LATEST_TAG: user/app:latest
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v3
-
name: Set up QEMU
uses: docker/setup-qemu-action@v2
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
-
name: Login to Docker Hub
uses: docker/login-action@v2
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
-
name: Build and export to Docker
uses: docker/build-push-action@v3
with:
context: .
load: true
tags: ${{ env.TEST_TAG }}
-
name: Test
run: |
docker run --rm ${{ env.TEST_TAG }}
-
name: Build and push
uses: docker/build-push-action@v3
with:
context: .
platforms: linux/amd64,linux/arm64
push: true
tags: ${{ env.LATEST_TAG }}
```
> **Note**
>
> Build time will not be increased with this workflow because internal cache
> for `linux/amd64` will be used from previous step on `Build and push` step
> so only `linux/arm64` will be actually built.