name: docker build and push

on:
  push:
    tags:
      - 'v*'

jobs:
  build:
    name: 'Build'
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v2
      - name: Extract tag
        id: prep
        if: "startsWith(github.ref, 'refs/tags/v')"
        run: |
          echo ::set-output name=tags::ghcr.io/qini7-sese/ehbot:${GITHUB_REF#refs/tags/v}
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v1
        with:
          platforms: all
      - name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v1
      - name: Login to GHCR
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: qini7-sese
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Build docker image
        uses: docker/build-push-action@v2
        with:
          push: true
          tags: |
            ghcr.io/qini7-sese/ehbot:amd64
            ${{ steps.prep.outputs.tags }}
      - name: Docker manifest push
        run: |
          docker manifest create ghcr.io/qini7-sese/ehbot:latest ghcr.io/qini7-sese/ehbot:amd64
          docker manifest push ghcr.io/qini7-sese/ehbot:latest