name: Build and release docker image

on:
  push:
    tags:
      - 'v*'

jobs:
  push_to_registry:
    name: Push Docker image to Docker Hub
    runs-on: ubuntu-latest
    steps:
      - name: Check out the repo
        uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b

      - name: Log in to Docker Hub
        if: github.event_name != 'pull_request'
        uses: docker/login-action@dd4fa0671be5250ee6f50aedf4cb05514abda2c7
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_ACCESS_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@f2a13332ac1ce8c0a71aeac48a150dbb1838ab67
        with:
          images: |
            ${{ github.repository_owner }}/maloja
          # generate Docker tags based on the following events/attributes
          tags: |
            type=semver,pattern={{version}}
          flavor: |
            latest=true

      - name: Set up QEMU
        uses: docker/setup-qemu-action@27d0a4f181a40b142cce983c5393082c365d1480

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@94ab11c41e45d028884a99163086648e898eed25

      - name: Cache Docker layers
        uses: actions/cache@48af2dc4a9e8278b89d7fa154b955c30c6aaab09
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-buildx-

      - name: Build and push Docker image
        uses: docker/build-push-action@ac9327eae2b366085ac7f6a2d02df8aa8ead720a
        with:
          context: .
          file: Containerfile
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          platforms: linux/amd64,linux/arm64,linux/arm/v7
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max

      # Temp fix
      # https://github.com/docker/build-push-action/issues/252
      # https://github.com/moby/buildkit/issues/1896
      - name: Move cache
        run: |
          rm -rf /tmp/.buildx-cache
          mv /tmp/.buildx-cache-new /tmp/.buildx-cache

      - name: Update Readme and short description
        uses: peter-evans/dockerhub-description@836d7e6aa8f6f32dce26f5a1dd46d3dc24997eae
        continue-on-error: true
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_ACCESS_TOKEN }}
          repository: krateng/maloja
          short-description: ${{ github.event.repository.description }}