name: build

on:
  push:
    branches: [main]
    tags: ["v*"]
  workflow_dispatch:

env:
  IMAGE: registry.traberph.de/public/homepage
  # Baked in at build time (canonical URLs); override with a repository variable.
  SITE_URL: ${{ vars.SITE_URL || 'https://traberph.de' }}
  # Default Harbor instance baked into the image as an env var (overridable at runtime).
  HARBOR_URL: ${{ vars.HARBOR_URL || 'https://registry.traberph.de' }}

jobs:
  image:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7

      # Tag scheme for Flux image automation: <UTC yyyymmddHHMMSS>-<short sha>,
      # e.g. 20260926154233-1a2b3c4. Timestamps sort numerically, see README.
      - name: Compute tags
        id: tags
        run: |
          ts="$(date -u +%Y%m%d%H%M%S)"
          sha="$(git rev-parse --short=7 HEAD)"
          tags="${IMAGE}:${ts}-${sha}"
          if [ "${GITHUB_REF_TYPE}" = "tag" ]; then
            tags="${tags},${IMAGE}:${GITHUB_REF_NAME}"
          else
            tags="${tags},${IMAGE}:latest"
          fi
          echo "tags=${tags}" >> "$GITHUB_OUTPUT"
          echo "created=$(date -u +%Y-%m-%dT%H:%M:%SZ)" >> "$GITHUB_OUTPUT"
          echo "sha=$(git rev-parse HEAD)" >> "$GITHUB_OUTPUT"
          echo "Tags: ${tags}"

      - uses: docker/setup-qemu-action@v4
      - uses: docker/setup-buildx-action@v4

      - uses: docker/login-action@v4
        with:
          registry: registry.traberph.de
          username: ${{ secrets.REGISTRY_USERNAME }}
          password: ${{ secrets.REGISTRY_TOKEN }}

      - uses: docker/build-push-action@v7
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ steps.tags.outputs.tags }}
          build-args: |
            SITE_URL=${{ env.SITE_URL }}
            HARBOR_URL=${{ env.HARBOR_URL }}
          labels: |
            org.opencontainers.image.source=${{ github.server_url }}/${{ github.repository }}
            org.opencontainers.image.revision=${{ steps.tags.outputs.sha }}
            org.opencontainers.image.created=${{ steps.tags.outputs.created }}