build_docker_images.yml

name: Build Docker Images

on: workflow_dispatch

jobs:
  build-docker:
    name: Build docker images for CI
    runs-on: ubuntu-latest
    permissions:
      packages: write
      contents: read
    env:
      IMAGE: "ghcr.io/nikolausdemmel/rootba/ubuntu-ci-rootba"
    steps:
      - name: Check out the repo
        uses: actions/checkout@v3
      - name: Login to GitHub Container Registry
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Build docker images
        shell: bash
        run: |
          cd ci/docker
          for tag in 20.04 22.04; do
            # fetches the latest image for cache (not failing if image is not found)
            docker pull $IMAGE:$tag || true
            docker build --pull --cache-from $IMAGE:$tag -f Dockerfile_$tag -t $IMAGE:$tag .
            docker push $IMAGE:$tag
          done
          # tag the last image as 'latest'
          docker tag $IMAGE:$tag $IMAGE:latest
          docker push $IMAGE:latest