docker-build.yaml

name: Docker Build

on:
  push:
    branches:
      - "master"
    tags:
      - "*"
  pull_request:

env:
  build_platforms: ${{ vars.BUILD_PLATFORMS || 'linux/amd64,linux/arm64/v8' }}
  build_image: ${{ vars.BUILD_IMAGE || 'ghcr.io/isso-comments/isso' }}

jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      packages: write
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v4
        with:
          flavor: |
            latest=false
          images: ${{ env.build_image }}
          tags: |
            type=ref,event=pr
            type=semver,pattern={{major}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{version}}
            type=raw,value=latest,enable={{is_default_branch}}
            type=raw,value=release,enable=${{ github.ref_type == 'tag' }}

      - name: Login to Github Container Registry
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

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

      - name: Build and push
        id: docker_build
        uses: docker/build-push-action@v4
        with:
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          platforms: ${{ env.build_platforms }}

      - name: Image digest
        run: echo ${{ steps.docker_build.outputs.digest }}