name: CI/CD Pipeline

on:
  push:

jobs:
  publish-docker-image:
    if: github.ref == 'refs/heads/master'
    name: Publish Docker image
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v2

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
        with:
          version: latest
          buildkitd-flags: --debug

      # Caching strategy from: https://github.com/docker/build-push-action/blob/master/docs/advanced/cache.md#github-cache
      - name: Cache Docker layers for ${{ matrix.service }}
        uses: actions/cache@v2
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-fly-shortener-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-buildx-fly-shortener-

      - name: Get image tags
        id: image-tags
        run: |
          export GIT_SHA="${{ github.sha }}"
          export GIT_SHA_SHORT=${GIT_SHA:0:7}
          echo "::set-output name=sha::$GIT_SHA_SHORT"

      - name: Login to GAR
        uses: docker/login-action@v1
        with:
          registry: us-east4-docker.pkg.dev
          username: _json_key
          password: ${{ secrets.GCR_JSON_KEY }}

      - name: Build and push ${{ matrix.service }}
        id: docker_build
        uses: docker/build-push-action@v2
        with:
          push: true
          tags: |
            us-east4-docker.pkg.dev/assemble-services/apps/link-shortener:latest
            us-east4-docker.pkg.dev/assemble-services/apps/link-shortener:${{ steps.image-tags.outputs.sha }}
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,dest=/tmp/.buildx-cache-new

      # 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