Build Docker image for Docker Hub in the GitHub Action

.github/workflows/readme-release.yml

@@ -148,6 +148,20 @@ jobs:
           printf 'Release notes:\n%s\n' "$RELEASE_NOTES"
           printf 'RELEASE_NAME=v%s\n' "$VERSIONTAG_THIS" >> "$GITHUB_ENV"
           printf 'RELEASE_NOTES<<EOF\n%s\nEOF\n' "$RELEASE_NOTES" >> "$GITHUB_ENV"
+      - name: Login to Docker Hub
+        if: env.VERSIONTAG_THIS != ''
+        uses: docker/login-action@v1
+        with:
+          username: mlocati
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Build docker image and push to Docker Hub
+        uses: docker/build-push-action@v2
+        if: env.VERSIONTAG_THIS != ''
+        with:
+          push: true
+          tags: |
+            mlocati/php-extension-installer:${{ env.VERSIONTAG_THIS }}
+            mlocati/php-extension-installer:latest
       - name: Create release
         id: create_release
         if: env.VERSIONTAG_THIS != ''