name: atlantis-base

on:
  push:
    paths:
      - 'docker-base/Dockerfile.*'
      - '.github/workflows/atlantis-base.yml'
    branches:
      - "main"
  pull_request:
    paths:
      - 'docker-base/Dockerfile.*'
      - '.github/workflows/atlantis-base.yml'
  workflow_dispatch:

defaults:
  run:
    working-directory: docker-base

concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
  cancel-in-progress: true

jobs:
  build:
    strategy:
      matrix:
        image_type: [alpine, debian]
    runs-on: ubuntu-22.04
    env:
      DOCKERFILE: "Dockerfile.${{ matrix.image_type }}"
      IMAGE_BASE: ghcr.io/${{ github.repository_owner }}/atlantis-base
      IMAGE_SUFFIX: ${{ matrix.image_type != 'alpine' && format('-{0}', matrix.image_type) || '' }}
    steps:
    - uses: actions/checkout@v3

    - name: Set up QEMU
      uses: docker/setup-qemu-action@v2
      with:
        image: tonistiigi/binfmt:latest
        platforms: arm64,arm

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

    - name: Login to Packages Container registry
      uses: docker/login-action@v2
      with:
        registry: ghcr.io
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}

    - name: Populate release version
      run: echo "RELEASE_VERSION=$(date +"%Y.%m.%d")" >> $GITHUB_ENV

    - name: Build and push atlantis-base:${{ env.RELEASE_VERSION }}${{ env.IMAGE_SUFFIX }} image
      uses: docker/build-push-action@v3
      with:
        cache-from: type=gha
        cache-to: type=gha,mode=max
        context: docker-base
        build-args: ATLANTIS_BASE_TAG_TYPE=${{ matrix.image_type }}
        file: docker-base/${{ env.DOCKERFILE }}
        platforms: linux/arm64/v8,linux/amd64,linux/arm/v7
        push: ${{ github.event_name != 'pull_request' }}
        # release version is the YYYYMMDD date of the build i.e. 20301210
        # release version also has the image type appended i.e. 20301210-alpine
        # release tag is latest i.e. latest
        # release tag also has the image type appended i.e. latest-alpine
        # if it's Dec 10, 2030 and alpine, it will do 20301210, 20301210-alpine, latest, latest-alpine
        # if it's Dec 10, 2030 and debian, it will do 20301210-debian, latest-debian
        tags: |
          ${{ env.IMAGE_BASE }}:${{ env.RELEASE_VERSION }}${{ env.IMAGE_SUFFIX }}
          ${{ env.IMAGE_BASE }}:${{ env.RELEASE_VERSION }}-${{ matrix.image_type }}
          ${{ env.IMAGE_BASE }}:latest${{ env.IMAGE_SUFFIX }}
          ${{ env.IMAGE_BASE }}:latest-${{ matrix.image_type }}