name: Docker Build

on:
  pull_request:
    branches:
      - master
  push:
    branches:
      - master
    tags:
      - 'v*.*.*'

env:
  IMAGE_NAME: ${{ vars.IMAGE_NAME || github.repository }}
  IMAGE_PLATFORMS: ${{ vars.IMAGE_PLATFORMS || 'linux/amd64,linux/arm64,linux/arm/v7' }}
  REGISTRY: ${{ vars.REGISTRY_NAME || secrets.REGISTRY_NAME || 'docker.io' }}

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      # https://github.com/actions/checkout
      - uses: actions/checkout@v4

      # https://github.com/docker/login-action
      - uses: docker/login-action@v3
        if: ${{ github.event_name != 'pull_request' }}
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ secrets.DOCKER_LOGIN_USERNAME || secrets.REGISTRY_USERNAME || github.actor }}
          password: ${{ secrets.DOCKER_LOGIN_PASSWORD || secrets.REGISTRY_PASSWORD || github.token }}

      # https://github.com/docker/setup-buildx-action
      - uses: docker/setup-buildx-action@v3

      # https://github.com/docker/setup-qemu-action
      - uses: docker/setup-qemu-action@v3

      # https://github.com/docker/metadata-action
      - uses: docker/metadata-action@v5
        id: meta
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=ref,event=tag
            type=ref,event=pr
            type=raw,value=latest,enable={{is_default_branch}}
            type=sha

      # https://github.com/docker/build-push-action
      - uses: docker/build-push-action@v5
        with:
          context: .
          platforms: ${{ env.IMAGE_PLATFORMS }}
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          build-args: COMMIT=${{ github.sha }}