CircleCI SBT build upload to GCR

.circleci-config.yml

version: 2.1
orbs:
  gcp-gcr: circleci/gcp-gcr@0.6.1

### Requires ENV VARS:
### IMAGE_NAME (E.g. github.com/myusername/myproject)
### IMAGE_BASE_VERSION  (E.g. 1.0)
### GOOGLE_CLOUD_KEYS
### GOOGLE_PROJECT_ID
### GOOGLE_COMPUTE_ZONE

jobs:
  build:
    docker:
      - image: flurdy/sbt:1.3.3-alpine
    environment:
      JAVA_OPTS: -Xmx4096m -Xss256m
      SBT_VERSION: 1.3.3
      TERM: dumb
    working_directory: ~/repo
    steps:
      - checkout
      - restore_cache:
          keys:
            - v1-dependencies-{{ checksum "build.sbt" }}
            - v1-dependencies-
      - run:
          name: Compile
          command: cat /dev/null | sbt test:compile
      - run:
          name: Test
          command: cat /dev/null | sbt test:test
      - run:
          name: Package application
          command: cat /dev/null | sbt stage
      - run:
          name: Zipping application
          command: |
            cat /dev/null | sbt dist
            mkdir -p /tmp/artifacts
            cp target/universal/*.zip /tmp/artifacts/
      - save_cache:
          paths:
            - ~/.m2
            - ~/.ivy2/cache
            - ~/.sbt
          key: v1-dependencies-{{ checksum "build.sbt" }}
      - store_artifacts:
          path: /tmp/artifacts
      - store_test_results:
          path: target/test-reports
      - persist_to_workspace:
          root: ./
          paths:
            - target/universal/stage

  build-image:
    docker:
      - image: circleci/buildpack-deps:stretch
    steps:
     - checkout
     - attach_workspace:
         at: ./
     - setup_remote_docker
     - run:
         name: Build Docker image
         command: docker build -t $IMAGE_NAME:latest .
     - run:
         name: Archive Docker image
         command: docker save -o image.tar $IMAGE_NAME
     - persist_to_workspace:
         root: .
         paths:
           - ./image.tar

  publish-image:
    docker:
      - image: circleci/buildpack-deps:stretch
    steps:
      - setup_remote_docker
      - attach_workspace:
          at: ./
      - run:
          name: Load archived Docker image
          command: docker load -i image.tar
      - run:
          name: Tagging
          command: |
            docker tag $IMAGE_NAME:latest gcr.io/$GOOGLE_PROJECT_ID/$IMAGE_NAME:latest
            docker tag $IMAGE_NAME:latest $IMAGE_NAME:$IMAGE_BASE_VERSION.$CIRCLE_BUILD_NUM
            docker tag $IMAGE_NAME:latest gcr.io/$GOOGLE_PROJECT_ID/$IMAGE_NAME:$IMAGE_BASE_VERSION.$CIRCLE_BUILD_NUM
      - gcp-gcr/gcr-auth:
          gcloud-service-key: GOOGLE_CLOUD_KEYS
          google-project-id: GOOGLE_PROJECT_ID
          google-compute-zone: GOOGLE_COMPUTE_ZONE
      - gcp-gcr/push-image:
          google-project-id: GOOGLE_PROJECT_ID
          image: $IMAGE_NAME
      - gcp-gcr/tag-image:
          google-project-id: GOOGLE_PROJECT_ID
          image: $IMAGE_NAME
          source-tag: latest
          target-tag: $IMAGE_BASE_VERSION.$CIRCLE_BUILD_NUM

workflows:
  version: 2
  build-master:
    jobs:
      - build:
          filters:
            branches:
              only: master
      - build-image:
          requires:
            - build
          filters:
            branches:
              only: master
      - publish-image:
          requires:
            - build-image
          context: google-cloud-registry
          filters:
            branches:
              only: master