compose-farm/.github/workflows/docker.yml

name: Build and Push Docker Image

on:
  workflow_run:
    workflows: ["Upload Python Package"]
    types: [completed]
  workflow_dispatch:
    inputs:
      version:
        description: 'Version to build (leave empty for latest)'
        required: false

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    # Only run if PyPI upload succeeded (or manual dispatch)
    if: ${{ github.event_name == 'workflow_dispatch' || github.event.workflow_run.conclusion == 'success' }}
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout
        uses: actions/checkout@v6

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract version
        id: version
        run: |
          if [ "${{ github.event_name }}" = "workflow_run" ]; then
            # Get version from the tag that triggered the release
            VERSION="${{ github.event.workflow_run.head_branch }}"
            # Strip 'v' prefix if present
            VERSION="${VERSION#v}"
          elif [ -n "${{ github.event.inputs.version }}" ]; then
            VERSION="${{ github.event.inputs.version }}"
          else
            VERSION=""
          fi
          echo "version=$VERSION" >> $GITHUB_OUTPUT

      - name: Wait for PyPI
        if: steps.version.outputs.version != ''
        run: |
          VERSION="${{ steps.version.outputs.version }}"
          echo "Waiting for compose-farm==$VERSION on PyPI..."
          for i in {1..30}; do
            if curl -sf "https://pypi.org/pypi/compose-farm/$VERSION/json" > /dev/null; then
              echo "✓ Version $VERSION available on PyPI"
              exit 0
            fi
            echo "Attempt $i: not yet available, waiting 10s..."
            sleep 10
          done
          echo "✗ Timeout waiting for PyPI"
          exit 1

      - name: Check if latest release
        id: latest
        run: |
          VERSION="${{ steps.version.outputs.version }}"
          # Get latest release tag from GitHub (strip 'v' prefix)
          LATEST=$(gh release view --json tagName -q '.tagName' | sed 's/^v//')
          echo "Building version: $VERSION"
          echo "Latest release: $LATEST"
          if [ "$VERSION" = "$LATEST" ]; then
            echo "is_latest=true" >> $GITHUB_OUTPUT
            echo "✓ This is the latest release, will tag as :latest"
          else
            echo "is_latest=false" >> $GITHUB_OUTPUT
            echo "⚠ This is NOT the latest release, skipping :latest tag"
          fi
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          # Only tag as 'latest' if this is the latest release (prevents re-runs of old releases from overwriting)
          tags: |
            type=semver,pattern={{version}},value=v${{ steps.version.outputs.version }}
            type=semver,pattern={{major}}.{{minor}},value=v${{ steps.version.outputs.version }}
            type=semver,pattern={{major}},value=v${{ steps.version.outputs.version }}
            type=raw,value=latest,enable=${{ steps.latest.outputs.is_latest }}

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          build-args: |
            VERSION=${{ steps.version.outputs.version }}
          cache-from: type=gha
          cache-to: type=gha,mode=max