containers.yml

name: Containers

on:
  # We want to run the CI when anything is pushed to master.
  # Since master is a protected branch this only happens when a PR is merged.
  # This is a double check in case the PR was stale and had some issues.
  push:
    branches:
      - master
    paths-ignore: # Prevents from running if only docs are updated
      - 'doc/**'
      - '**/*README*'
      - '**.md'
      - '**.rst'
  pull_request:
    paths-ignore: # Prevents from running if only docs are updated
      - 'doc/**'
      - '**/*README*'
      - '**.md'
      - '**.rst'
  workflow_dispatch:
  schedule:
  - cron: '0 0 * * 0' # weekly

# We want to cancel previous runs for a given PR or branch / ref if another CI
# run is requested.
# See: https://docs.github.com/en/actions/using-jobs/using-concurrency
concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

jobs:

  Image:
    runs-on: ubuntu-latest
    env:
      DOCKER_BUILDKIT: 1
    steps:

      - name: 🧰 Repository Checkout
        uses: actions/checkout@v4
        with:
          submodules: 'true'
  
      - name: 🔧 Generate image name
        id: generate
        run: |
          REPO='${{ github.repository }}'
          echo "image=ghcr.io/${REPO,,}/ubuntu/focal/build" >> $GITHUB_OUTPUT

      - name: ⛴️ Build container image
        run: docker build -t ${{ steps.generate.outputs.image }} -f Dockerfile .

      - name: 🛰️ Push container image
        if: github.event_name != 'pull_request'
        uses: pyTooling/Actions/with-post-step@r0
        with:
          main: |
            echo '${{ github.token }}' | docker login ghcr.io -u GitHub-Actions --password-stdin
            docker push ${{ steps.generate.outputs.image }}
          post: docker logout ghcr.io