.github/workflows/publish-build-containers.yml

name: Publish Build Containers

on:
  # We want to update this image regularly and when updating master
  schedule:
    - cron: '00 18 * * *'
  push:
    branches:
      - master

env:
  # Use docker.io for Docker Hub if empty
  REGISTRY: ghcr.io
  # github.repository as <account>/<repo>
  IMAGE_NAME: ${{ github.repository }}
jobs:

  publish_ghcr:
    name: Publish To GitHub Container Registry
    runs-on: ubuntu-latest
    strategy:
      matrix:
        os: [
          {distro: "ubuntu", version: "18.04", nick: bionic},
          {distro: "ubuntu", version: "20.04", nick: focal},
          {distro: "fedora", version: "34", nick: "f34"},
          {distro: "fedora", version: "36", nick: "f36"}
        ]

    steps:

    - uses: actions/checkout@v2

    # Login against registry except on PR
    # https://github.com/docker/login-action
    - name: Log into registry ${{ env.REGISTRY }}
      if: github.event_name != 'pull_request'
      uses: docker/login-action@v2
      with:
        registry: ${{ env.REGISTRY }}
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}

    - name: Build and push
      uses: docker/build-push-action@v3
      with:
        push: true
        build-args: |
          VERSION=${{ matrix.os.version }}
          SHORTNAME=${{ matrix.os.nick }}
        file: docker/build/Dockerfile.${{ matrix.os.distro }}
        tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ matrix.os.distro }}-${{ matrix.os.version }}