name: Docker Test

on:

  pull_request:

    branches:

      - main

jobs:

  changes:

    name: Detect changes

    runs-on: ubuntu-latest

    outputs:

      apps: ${{ steps.filter.outputs.apps }}

    steps:

      - uses: actions/checkout@v4

        with:

          fetch-depth: 0

      - name: Determine which apps to build

        id: filter

        run: |

          ALL='["backup","blobs","bookmarks","cellar","easel","feeds","jotts","kepler","library","og","posts","shrink","sipp"]'

          changed=$(git diff --name-only origin/${{ github.base_ref }}...HEAD)

          if echo "$changed" | grep -qE '^(pkg/|\.github/workflows/docker(-test)?\.yml)'; then

            echo "apps=${ALL}" >> "$GITHUB_OUTPUT"

            exit 0

          fi

          apps=()

          for app in backup blobs bookmarks cellar easel feeds jotts kepler library og posts shrink sipp; do

            if echo "$changed" | grep -q "^apps/${app}/"; then

              apps+=("\"${app}\"")

            fi

          done

          if [ ${#apps[@]} -eq 0 ]; then

            echo 'apps=[]' >> "$GITHUB_OUTPUT"

          else

            echo "apps=[$(IFS=,; echo "${apps[*]}")]" >> "$GITHUB_OUTPUT"

          fi

  build:

    name: build (${{ matrix.app }})

    needs: changes

    if: needs.changes.outputs.apps != '[]'

    runs-on: ubuntu-latest

    strategy:

      fail-fast: false

      matrix:

        app: ${{ fromJson(needs.changes.outputs.apps) }}

    steps:

      - uses: actions/checkout@v4

      - name: Set up Docker Buildx

        uses: docker/setup-buildx-action@v3

      - name: Build

        uses: docker/build-push-action@v6

        with:

          context: .

          file: apps/${{ matrix.app }}/Dockerfile

          push: false

          load: true

          tags: ${{ matrix.app }}:test

          cache-from: type=gha,scope=${{ matrix.app }}

          cache-to: type=gha,mode=max,scope=${{ matrix.app }}