CI.yml

name: CI

on:
  push:
    branches: ["**"]
  pull_request:
    branches: ["**"]
  workflow_dispatch:
    branches: ["**"]

jobs:
  collect-solutions:
    runs-on: ubuntu-20.04

    steps:
      - name: "Checkout code"
        uses: actions/checkout@v3

      - name: "Find Dockerfiles"
        id: "solutions"
        run: |
          RESULTS=()
          for DIR in $(find Prime* -type f -name Dockerfile ! -exec dirname {} \; | sort | sed -e 's|^./||'); do
          [ -f "${DIR}/build-no" ] && continue
          RESULTS+=( "${DIR}" )
          done
          SOLUTIONS=$(printf '%s\n' "${RESULTS[@]}" | jq -R . | jq -sc .)
          echo "solutions=${SOLUTIONS}" >> $GITHUB_OUTPUT

    outputs:
      solutions: ${{ steps.solutions.outputs.solutions }}

  build:
    env: 
      ENABLE_DOCKER_PUSH: ${{ github.repository_owner == 'PlummersSoftwareLLC' && github.ref == 'refs/heads/drag-race' }}

    runs-on: "ubuntu-20.04"

    needs: ["collect-solutions"]

    strategy:
      fail-fast: false
      matrix:
        solution: ${{ fromJson(needs.collect-solutions.outputs.solutions) }}

    steps:
      - name: "Checkout code"
        uses: actions/checkout@v3

      - name: "Normalize solution name"
        id: solution-name
        run: |
          NAME=$(echo "${{ matrix.solution }}" | sed -r 's/\//-/g' | tr '[:upper:]' '[:lower:]' | sed -r 's/(prime|solution_)//g')
          echo "normalized=${NAME}" >> $GITHUB_OUTPUT

      - name: Select arm64 build for solutions with arm64 flag file
        id: arch-arm64
        run: |
          if [[ -f "${{ matrix.solution }}/arch-arm64" ]]; then
          echo "build=true" >> $GITHUB_OUTPUT
          fi

      - name: Select amd64 build for solutions with amd64 or no flag file
        id: arch-amd64
        run: |
          if [[ -f "${{ matrix.solution }}/arch-amd64" || ! -f "${{ matrix.solution }}/arch-arm64" ]]; then
          echo "build=true" >> $GITHUB_OUTPUT
          fi

      - name: Lint Dockerfile
        uses: jbergstroem/hadolint-gh-action@v1
        with:
          dockerfile: "${{ matrix.solution }}/Dockerfile"
          output_format: tty
          error_level: 0
          config_file: ./config/hadolint.yml

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v2

      - name: Setup Docker Buildx
        uses: docker/setup-buildx-action@v2

      - name: Login to DockerHub
        if: ${{ env.ENABLE_DOCKER_PUSH == 'true' }}
        uses: docker/login-action@v2
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Build amd64
        if: steps.arch-amd64.outputs.build
        uses: docker/build-push-action@v3
        with:
          tags: primeimages/primes:${{ steps.solution-name.outputs.normalized }}
          context: ${{ matrix.solution }}
          platforms: linux/amd64
          push: ${{ env.ENABLE_DOCKER_PUSH }}
          cache-from: type=registry,ref=primeimages/primes:${{ steps.solution-name.outputs.normalized }}
          cache-to: type=inline
      
      - name: Build arm64
        if: steps.arch-arm64.outputs.build
        uses: docker/build-push-action@v3
        with:
          tags: primeimages/primes:${{ steps.solution-name.outputs.normalized }}
          context: ${{ matrix.solution }}
          platforms: linux/arm64
          push: ${{ env.ENABLE_DOCKER_PUSH }}
          cache-from: type=registry,ref=primeimages/primes:${{ steps.solution-name.outputs.normalized }}
          cache-to: type=inline