name: Build Docker image

on:
  push:
  schedule:
    - cron: "0 10 * * *"

jobs:
  build_image:
    name: Build image
    runs-on: docker
    if: env.SCHEDULED == 'true' || !contains(github.event.commits[0].message, '[skip ci]')

    env:
      VERSION: 2.8
      SCHEDULED: ${{ github.event_name == 'schedule' }}
      PUSHED: ${{ github.event_name == 'push' }}
      REGISTRY: git.korhonen.cc
      REPO: ${{ env.REGISTRY }}/functionalhacker/caddy

    steps:
      - name: Check if update available
        if: env.SCHEDULED == 'true'
        id: check
        uses: https://github.com/ClementTsang/docker-check-base-image-diff@v0.0.2
        with:
          base-image: docker://caddy:${{ env.VERSION }}
          derived-image: docker://${{ env.REPO }}:latest

      - name: Check result
        if: env.SCHEDULED == 'true'
        run: echo "Needs updating = ${{ steps.check.outputs.differs }}"

      - name: Set up Docker Buildx
        if: env.PUSHED == 'true' || steps.check.outputs.differs == 'true'
        uses: docker/setup-buildx-action@v3

      - name: Login to Docker registry
        if: env.PUSHED == 'true' || steps.check.outputs.differs == 'true'
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ secrets.REGISTRY_USER }}
          password: ${{ secrets.REGISTRY_PASSWORD }}

      - name: Get point release
        id: point_release
        if: env.PUSHED == 'true' || steps.check.outputs.differs == 'true'
        run: |
          VERSION="$(skopeo list-tags docker://caddy | jq -r '[.Tags[] | select(test("^${{ VERSION }}.[0-9]$"))] | last')"
          echo "Point release: $VERSION"
          echo "version=$VERSION" >> $GITHUB_OUTPUT

      - name: Build and push image
        if: env.PUSHED == 'true' || 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 }}