container.yml

name: Container

# Exercise the container definition only when it changes, so the dev/artifact
# images can't rot while nobody is using them.
on:
  push:
    branches: [main]
    paths: [".devcontainer/**", ".dockerignore"]
  pull_request:
    branches: [main]
    paths: [".devcontainer/**", ".dockerignore"]

jobs:
  preflight:
    uses: ./.github/workflows/preflight.yml

  build:
    needs: preflight
    if: needs.preflight.outputs.ok == 'true'
    runs-on: ubuntu-latest
    permissions:
      contents: read
    steps:
      - uses: actions/checkout@v6

      - name: Build dev stage
        run: docker build --target dev -f .devcontainer/Dockerfile .

      - name: Build artifact stage (runs the test suite inside)
        run: docker build --target artifact -f .devcontainer/Dockerfile .