image-build.yaml

# name: Create and publish a Docker image

# # Configures this workflow to run every time a change is pushed to the branch called `release`.
# on:
#   push:
#     branches: ['main']

# # Defines two custom environment variables for the workflow. These are used for the Container registry domain, and a name for the Docker image that this workflow builds.
# env:
#   REGISTRY: ghcr.io
#   IMAGE_NAME: brandtkeller/image/personal-blog

# # There is a single job in this workflow. It's configured to run on the latest available version of Ubuntu.
# jobs:
#   build-and-push-image:
#     runs-on: ubuntu-latest
#     # Sets the permissions granted to the `GITHUB_TOKEN` for the actions in this job.
#     permissions:
#       contents: read
#       packages: write
#       # 
#     steps:
#       - name: Checkout repository
#         uses: actions/checkout@v3
#       # Uses the `docker/login-action` action to log in to the Container registry registry using the account and password that will publish the packages. Once published, the packages are scoped to the account defined here.
#       - name: Log in to the Container registry
#         uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
#         with:
#           registry: ${{ env.REGISTRY }}
#           username: ${{ github.actor }}
#           password: ${{ secrets.PACKAGE_TOKEN }}
      
#       - name: Set up Docker Buildx
#         uses: docker/setup-buildx-action@v3
#         with:
#           platforms: linux/arm64, linux/amd64

#       # This step uses [docker/metadata-action](https://github.com/docker/metadata-action#about) to extract tags and labels that will be applied to the specified image. The `id` "meta" allows the output of this step to be referenced in a subsequent step. The `images` value provides the base name for the tags and labels.
#       - name: Extract metadata (tags, labels) for Docker
#         id: meta
#         uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
#         with:
#           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
#           flavor: |
#             latest = true
#       # This step uses the `docker/build-push-action` action to build the image, based on your repository's `Dockerfile`. If the build succeeds, it pushes the image to GitHub Packages.
#       # It uses the `context` parameter to define the build's context as the set of files located in the specified path. For more information, see "[Usage](https://github.com/docker/build-push-action#usage)" in the README of the `docker/build-push-action` repository.
#       # It uses the `tags` and `labels` parameters to tag and label the image with the output from the "meta" step.
#       - name: Build and push Docker image
#         uses: docker/build-push-action@v5
#         with:
#           context: .
#           platforms: linux/arm64, linux/amd64
#           push: true
#           tags: ${{ steps.meta.outputs.tags }}
#           labels: ${{ steps.meta.outputs.labels }}