name: CI to Docker Hub

on:
  push:
    tags:
      - "v*.*.*"

jobs:
  build:
    runs-on: self-hosted
    steps:
      - name: Check Out Repo 
        uses: actions/checkout@v2

      - name: Prepare tags
        id: prep
        run: |
          DOCKER_IMAGE=${{ secrets.DOCKER_HUB_USERNAME }}/upsnap
          VERSION=${GITHUB_REF#refs/tags/}
          TAGS="${DOCKER_IMAGE}:${VERSION},${DOCKER_IMAGE}:${VERSION:0:2},${DOCKER_IMAGE}:latest"
          echo ::set-output name=tags::${TAGS}

      - name: Cache Docker layers
        uses: actions/cache@v2
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-buildx-

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v1

      - name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v1

      - name: Login to Docker Hub
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKER_HUB_USERNAME }}
          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}

      - name: Build and push
        id: docker_build
        uses: docker/build-push-action@v2
        with:
          context: ./
          file: ./Dockerfile
          platforms: linux/amd64,linux/arm64,linux/arm/v7
          builder: ${{ steps.buildx.outputs.name }}
          push: true
          tags: ${{ steps.prep.outputs.tags }}
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,dest=/tmp/.buildx-cache

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