name: atlantis-image

on:
  push:
    branches:
      - 'main'
    tags:
      - v*.*.* # stable release like, v0.19.2
      - v*.*.*-pre.* # pre release like, v0.19.0-pre.calendardate
  pull_request:
    paths:
      - 'Dockerfile'
      - '.github/workflows/atlantis-image.yml'
  workflow_dispatch:

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:
      RELEASE_TYPE: ${{ contains(github.ref, 'pre') && 'pre' || 'stable' }}
      RELEASE_TAG: ${{ contains(github.ref, 'pre') && 'prerelease-latest' || 'latest' }}
      IMAGE_BASE: ghcr.io/${{ github.repository_owner }}/atlantis
      IMAGE_SUFFIX: ${{ matrix.image_type != 'alpine' && format('-{0}', matrix.image_type) || '' }}
    steps:
    - uses: actions/checkout@v3

    - uses: actions/setup-go@v3
      with:
        go-version: 1.19

    - 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 }}

    # Publish dev image to container registry
    - name: Build and push atlantis:dev${{ env.IMAGE_SUFFIX }} image
      if: ${{ contains(fromJson('["push", "pull_request"]'), github.event_name) }}
      uses: docker/build-push-action@v3
      with:
        cache-from: type=gha
        cache-to: type=gha,mode=max
        context: .
        build-args: ATLANTIS_BASE_TAG_TYPE=${{ matrix.image_type }}
        platforms: linux/arm64/v8,linux/amd64,linux/arm/v7
        push: ${{ github.event_name != 'pull_request' }}
        tags: |
          ghcr.io/${{ github.repository_owner }}/atlantis:dev${{ env.IMAGE_SUFFIX }}
          ghcr.io/${{ github.repository_owner }}/atlantis:dev-${{ matrix.image_type }}

    # Publish release to container registry
    - name: Populate release version
      if: |
        contains(fromJson('["push", "pull_request"]'), github.event_name) &&
        startsWith(github.ref, 'refs/tags/')
      run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV

    - name: "Build and push atlantis:${{ env.RELEASE_VERSION }} image for ${{ env.RELEASE_TYPE }} release"
      if: |
        contains(fromJson('["push", "pull_request"]'), github.event_name) &&
        startsWith(github.ref, 'refs/tags/')
      uses: docker/build-push-action@v3
      with:
        cache-from: type=gha
        cache-to: type=gha,mode=max
        context: .
        build-args: ATLANTIS_BASE_TAG_TYPE=${{ matrix.image_type }}
        platforms: linux/arm64/v8,linux/amd64,linux/arm/v7
        push: ${{ github.event_name != 'pull_request' }}
        # release version is the name of the tag i.e. v0.10.0
        # release version also has the image type appended i.e. v0.10.0-alpine
        # release tag is either pre-release or latest i.e. latest
        # release tag also has the image type appended i.e. latest-alpine
        # if it's v0.10.0 and alpine, it will do v0.10.0, v0.10.0-alpine, latest, latest-alpine
        # if it's v0.10.0 and debian, it will do v0.10.0-debian, latest-debian
        tags: |
          ${{ env.IMAGE_BASE }}:${{ env.RELEASE_VERSION }}${{ env.IMAGE_SUFFIX }}
          ${{ env.IMAGE_BASE }}:${{ env.RELEASE_VERSION }}-${{ matrix.image_type }}
          ${{ env.IMAGE_BASE }}:${{ env.RELEASE_TAG }}${{ env.IMAGE_SUFFIX }}
          ${{ env.IMAGE_BASE }}:${{ env.RELEASE_TAG }}-${{ matrix.image_type }}