on:
  push:
  schedule:
    - cron: "0 12 * * *"
jobs:
  build_image:
    name: Build image
    env:
      VERSION: 22.04
      SCHEDULED: ${{ github.event_name == 'schedule' }}
      PUSHED: ${{ github.event_name == 'push' }}
      REGISTRY: git.korhonen.cc
      REPO: ${{ env.REGISTRY }}/functionalhacker/ubuntu-act
    runs-on: docker
    steps:
      - name: Check if update available
        if: env.SCHEDULED
        id: check
        uses: https://github.com/ClementTsang/docker-check-base-image-diff@v0.0.2
        with:
          base-image: docker://ghcr.io/catthehacker/ubuntu:act-${{ env.VERSION }}
          derived-image: docker://${{ env.REPO }}:latest
      - name: Check result
        if: env.SCHEDULED
        run: echo "Needs updating = ${{ steps.check.outputs.differs }}"
      - name: Set up Docker Buildx
        if: env.PUSHED || ${{ steps.check.outputs.differs == true }}
        uses: docker/setup-buildx-action@v3
      - name: Login to Docker registry
        if: env.PUSHED || ${{ steps.check.outputs.differs == true }}
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ secrets.REGISTRY_USER }}
          password: ${{ secrets.REGISTRY_PASSWORD }}
      - name: Build and push image
        if: env.PUSHED || ${{ steps.check.outputs.differs == true }}
        uses: docker/build-push-action@v5
        with:
          push: true
          build-args: VERSION=${{ env.VERSION }}
          tags: |
            ${{ env.REPO }}:latest
            ${{ env.REPO }}:${{ env.VERSION }}