build_container.yml

---
name: 'Build container'
"on":
  pull_request:
  push:
    branches:
      - main
permissions:
  packages: write
  contents: read
jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.12'
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
      -   # https://github.com/docker/login-action/#github-container-registry
        name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Build and push
        id: docker_build
        uses: docker/build-push-action@v6
        with:
          push: ${{ github.ref == 'refs/heads/main' }}
          platforms: linux/amd64,linux/arm64
          # https://github.com/docker/build-push-action/issues/254
          tags: ghcr.io/${{ github.repository }}:latest
      - name: Image digest
        run: echo ${{ steps.docker_build.outputs.digest }}