name: Docker Build (PR)

on:
  pull_request:
    types: [opened, synchronize, reopened]

permissions:
  contents: read

jobs:
  build-image:
    name: Build Docker image
    runs-on: ubuntu-latest
    if: ${{ !contains(github.event.pull_request.title, '[skip-ci]') }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@master
        with:
          fetch-depth: 0
          fetch-tags: true

      - name: Derive lowercase repo name
        run: |
          echo "REPO_NAME=$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV

      - name: setup uv
        uses: astral-sh/setup-uv@v5
      - name: Install Python
        run: uv python install
        with:
          python-version-file: "pyproject.toml"
      - name: Install project dependencies
        run: |
          uv sync --all-groups
          uv add pip
          uv export --format requirements.txt -o requirements.txt

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

      - name: Build image (no push)
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ./Dockerfile
          push: false
          tags: ${{ secrets.REGISTRY }}/${{ env.REPO_NAME }}:pr-${{ github.event.number }}