name: run Docker CI

on:
  push:
    branches:
      - main
      - master
      - add-docker-build
  pull_request:
    branches:
      - main
      - master

env:
  CPM_SOURCE_CACHE: ${{ github.workspace }}/cpm_modules

jobs:
  build:
    name: CI build docker
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2

      #
      # configure and build in GitHub CI as smoke test

      # speed up configure step by installing boost as system lib, also use Ninja for faster builds
      - name: speed up configure and build
        shell: bash
        run: sudo apt-get update && sudo apt-get install -y libboost-all-dev ninja-build

      # use GitHub cache to cache dependencies
      - uses: actions/cache@v2
        with:
          path: "**/cpm_modules"
          key: ${{ github.workflow }}-cpm-modules-${{ hashFiles('**/CMakeLists.txt', '**/*.cmake') }}

      - name: configure
        run: cmake -S standalone -B build -G Ninja -D CMAKE_BUILD_TYPE=Release

      - name: build
        run: cmake --build build

      #
      # end GitHub CI local build

      - name: set up Docker Buildx for multi-platform support
        uses: docker/setup-buildx-action@v1

      - name: set up QEMU for multi-platform support
        uses: docker/setup-qemu-action@v1

      # build image but do NOT push to DockerHub
      - name: build Docker image
        uses: docker/build-push-action@v2
        with:
          file: ./standalone/Dockerfile
          platforms: linux/amd64,linux/arm64
          push: false
          tags: ${{ secrets.DOCKERHUB_USERNAME }}/greeter-webapi:ci
          cache-from: type=gha
          cache-to: type=gha,mode=max