name: Build multi-platform docker images via buildx

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

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
      -
        name: Set Prepare
        id: prep
        run: |
          DOCKER_IMAGE=vx3r/wg-gen-web
          VERSION=edge
          if [[ $GITHUB_REF == refs/tags/* ]]; then
          VERSION=${GITHUB_REF#refs/tags/}
          elif [[ $GITHUB_REF == refs/heads/* ]]; then
          VERSION=$(echo ${GITHUB_REF#refs/heads/} | sed -r 's#/+#-#g')
          elif [[ $GITHUB_REF == refs/pull/* ]]; then
          VERSION=pr-${{ github.event.number }}
          fi
          TAGS="${DOCKER_IMAGE}:${VERSION}"
          if [ "${{ github.event_name }}" = "push" ]; then
          TAGS="$TAGS,${DOCKER_IMAGE}:sha-${GITHUB_SHA::8}"
          fi
          TAGS="$TAGS,${DOCKER_IMAGE}:latest"
          echo ::set-output name=version::${VERSION}
          echo ::set-output name=tags::${TAGS}
          echo ::set-output name=created::$(date -u +'%Y-%m-%dT%H:%M:%SZ')
          echo ::set-output name=sha_short::$(git rev-parse --short HEAD)
      -
        name: Set up QEMU
        uses: docker/setup-qemu-action@v1
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
      -
        name: Login to DockerHub
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKER_LOGIN_USERNAME }}
          password: ${{ secrets.DOCKER_LOGIN_PASSWORD }}
      -
        name: Build and push
        uses: docker/build-push-action@v2
        with:
          context: .
          platforms: linux/amd64,linux/arm64,linux/arm/v7
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.prep.outputs.tags }}
          labels: |
            org.opencontainers.image.source=${{ github.event.repository.html_url }}
            org.opencontainers.image.created=${{ steps.prep.outputs.created }}
            org.opencontainers.image.revision=${{ github.sha }}
          build-args: |
            COMMIT=${{ steps.prep.outputs.sha_short }}