docker.yml

name: Publish Docker image

on:
  push:
    branches: [ master ]
  pull_request:
    branches: [ master ]

  workflow_dispatch:

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        image:
          - circleci_ubuntu-22.04
          - circleci_ubuntu-20.04
          - mrchem_ubuntu-18.04
          - circleci_ubuntu-18.04
          - circleci_ubuntu-18.04-conda
      # Keep going on other deployments if anything bloops
      fail-fast: false

    # Defines custom environment variables for the workflow. 
    env:
      # the Container registry domain
      REGISTRY: ghcr.io

    # Sets the permissions granted to the `GITHUB_TOKEN` for the actions in
    # this job.
    permissions:
      actions: read
      contents: read
      packages: write

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      # 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@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # 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: Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: |
            ${{ env.REGISTRY }}/${{ github.repository }}/${{ matrix.image }}
          flavor: |
            latest=true
          tags: |
            type=sha

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      # 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: ${{ matrix.image }}
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          secrets: |
            "docker_github_api=${{ secrets.DOCKER_GITHUB_API }}"