name: Build excalidraw-library

# ADR-0002 / no-local-builds: excalidraw-library (infra-owned Go app behind
# draw.viktorbarzin.me) builds off-infra on GHA → private ghcr; Keel polls
# ghcr:latest and rolls the deployment. Replaces the manual DockerHub pushes
# (viktorbarzin/excalidraw-library:v4 stays frozen as the rollback image).
on:
  push:
    branches: [master]
    paths:
      - 'stacks/excalidraw/project/**'
  workflow_dispatch: {}

permissions:
  contents: read
  packages: write

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-go@v5
        with:
          go-version: '1.21'
      - run: go test ./...
        working-directory: stacks/excalidraw/project
      - uses: docker/setup-buildx-action@v3
      - uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - uses: docker/build-push-action@v6
        with:
          context: stacks/excalidraw/project
          platforms: linux/amd64
          provenance: false
          push: true
          tags: |
            ghcr.io/viktorbarzin/excalidraw-library:latest
            ghcr.io/viktorbarzin/excalidraw-library:${{ github.sha }}