name: 'Publish Container Image'

# Controls when the action will run. Triggers the workflow on push or pull
# request events but only for the master branch
on:
  push:
    branches:
      - '*'

permissions:
  contents: 'read'
  packages: 'write'

# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
  # This workflow contains a single job called "build"
  build-and-publish:
    # The type of runner that the job will run on
    runs-on: 'ubuntu-latest'

    # Steps represent a sequence of tasks that will be executed as part of the job
    steps:
      - name: 'Checkout Repository 🛎️'
        uses: 'actions/checkout@v2'

      - name: 'Build 🏗️'
        id: 'build'
        run: |
          image="$( \
            basename "$(echo "${{ github.repository }}")" \
            | tr '[:upper:]' '[:lower:]' \
            | sed 's/docker-//' \
          )"
          echo "image=$image" >> "$GITHUB_OUTPUT"

          docker build --file "Dockerfile" --tag "$image" .

      - name: 'Login to GitHub Container Registry 🔑'
        uses: 'docker/login-action@v1'
        if: '${{ github.ref_name }} == ${{ github.event.repository.default_branch }}'
        with:
          registry: 'ghcr.io'
          username: '${{ github.repository_owner }}'
          password: '${{ secrets.GITHUB_TOKEN }}'

      - name: 'Publish to Registry 🐳'
        if: '${{ github.ref_name }} == ${{ github.event.repository.default_branch }}'
        run: |
          image="${{ steps.build.outputs.image }}"
          repo="ghcr.io/${{ github.repository_owner }}/$image"
          branch="$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')"
          version="$branch"

          echo "repo = $repo"
          echo "image = $image"
          echo "version = $version"

          docker tag "$image" "$repo/$image:$version"
          docker push "$repo/$image:$version"

          # Use Docker `latest` tag convention
          if [[ "${{ github.event.repository.default_branch }}" == "$branch" ]]; then
            docker tag "$image" "$repo/$image:latest"
            docker push "$repo/$image:latest"
          fi

          echo "registry_uri=$repo/$image" >> "$GITHUB_OUTPUT"