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Troubleshooting

Cannot push to a registry
- BuildKit container logs
- With containerd
repository name must be lowercase

Cannot push to a registry

While pushing to a registry, you may encounter these kinds of issues:

failed commit on ref "layer-sha256:...": invalid content digest in response: invalid checksum digest format
failed commit on ref "layer-sha256:...": no response
failed commit on ref "manifest-sha256:...": unexpected status: 400 Bad Request
failed commit on ref "manifest-sha256:...": unexpected status: 401 Unauthorized
unexpected response: 401 Unauthorized

These issues are not directly related to this action but are rather linked to Buildx, BuildKit, containerd or the registry on which you're pushing your image. The quality of error message depends on the registry and are usually not very informative.

BuildKit container logs

To help you solve this, you have to enable debugging in the setup-buildx action step and attach BuildKit container logs to your issue.

With containerd

Next you can test pushing with containerd action using the following workflow. If it works then open an issue on BuildKit repository.

name: containerd

on:
  push:

jobs:
  containerd:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v4
      -
        name: Set up QEMU
        uses: docker/setup-qemu-action@v3
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
        with:
          buildkitd-flags: --debug
      -
        name: Set up containerd
        uses: crazy-max/ghaction-setup-containerd@v2
      -
        name: Build Docker image
        uses: docker/build-push-action@v6
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          tags: docker.io/user/app:latest
          outputs: type=oci,dest=/tmp/image.tar
      -
        name: Import image in containerd
        run: |
          sudo ctr i import --base-name docker.io/user/app --digests --all-platforms /tmp/image.tar          
      -
        name: Push image with containerd
        run: |
          sudo ctr --debug i push --user "${{ secrets.DOCKER_USERNAME }}:${{ secrets.DOCKER_PASSWORD }}" docker.io/user/app:latest

`repository name must be lowercase`

You may encounter this issue if you're using github.repository as a repo slug in your tag:

#6 exporting to image
#6 exporting layers
#6 exporting layers 1.2s done
#6 exporting manifest sha256:b47f7dfb97b89ccd5de553af3c8cd94c4795884cbe5693e93946b1d95a7b1d12 0.0s done
#6 exporting config sha256:995e93fab8196893192f08a38deea6769dc4d98f86cf705eccc24ec96a3e271c 0.0s done
#6 ERROR: invalid reference format: repository name must be lowercase
------
 > exporting to image:
------
error: failed to solve: invalid reference format: repository name must be lowercase

or a cache reference:

#10 importing cache manifest from ghcr.io/My-Org/repo:main
#10 ERROR: invalid reference format: repository name must be lowercase

To fix this issue you can use our metadata action to generate sanitized tags:

- name: Docker meta
  id: meta
  uses: docker/metadata-action@v4
  with:
    images: ghcr.io/${{ github.repository }}
    tags: latest

- name: Build and push
  uses: docker/build-push-action@v6
  with:
    context: .
    push: true
    tags: ${{ steps.meta.outputs.tags }}

Or a dedicated step to sanitize the slug:

- name: Sanitize repo slug
  uses: actions/github-script@v6
  id: repo_slug
  with:
    result-encoding: string
    script: return 'ghcr.io/${{ github.repository }}'.toLowerCase()

- name: Build and push
  uses: docker/build-push-action@v6
  with:
    context: .
    push: true
    tags: ${{ steps.repo_slug.outputs.result }}:latest

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