name: validate docker build

on:
  pull_request:
    paths:
      - "backend/src/**"
      - "backend/Dockerfile"
      - "backend/pyproject.toml"
      - "backend/uv.lock"
      - "README.md"
      - ".github/workflows/build-docker.yml"

jobs:
  build:
    name: build backend image
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: set up docker buildx
        uses: docker/setup-buildx-action@v3

      - name: build docker image
        # Build from root context using backend/Dockerfile
        run: docker build -f backend/Dockerfile .