Rails 5.1 CircleCI 2.0 Configuration

config.yml

version: 2
jobs:
  build:
    environment:
    working_directory: ~/circleci-myapp
    docker:
      - image: circleci/ruby:2.4.2-node-browsers
        environment:
          CC_TEST_REPORTER_ID: XXXYYY
          RAILS_ENV: test
          TEST_REPORT_PATH: "test/reports"
      - image: circleci/postgres:9.6.2-alpine
        environment:
          POSTGRES_USER: circleci
    parallelism: 2
    steps:
      - checkout

      # Restore bundle cache
      - type: cache-restore
        key: myapp-bundle-{{ checksum "Gemfile.lock" }}

      # Restore yarn cache
      - type: cache-restore
        key: myapp-yarn-{{ checksum "yarn.lock" }}

      # Install gem dependencies
      - run: bundle install --path vendor/bundle

      # Install Javascript dependencies
      - run: bin/yarn install

      # Store bundle cache
      - type: cache-save
        key: myapp-bundle-{{ checksum "Gemfile.lock" }}
        paths:
          - vendor/bundle

      # Store yarn cache
      - type: cache-save
        key: myapp-yarn-{{ checksum "yarn.lock" }}
        paths:
          - ~/.yarn-cache

      # Database setup
      - run: bin/rails db:create
      - run: bin/rails db:schema:load

      # Code Climate setup
      - run: curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
      - run: chmod +x ./cc-test-reporter
      - run: sudo apt-get -y -qq install awscli
      - run: aws s3 rm s3://myapp/coverage/$CIRCLE_PREVIOUS_BUILD_NUM --recursive

      # Run Ruby unit tests and app integration tests in parallel
      - type: shell
        command: |
          bin/rails test $(circleci tests glob "test/**/*_test.rb" | circleci tests split --split-by=timings)

      # Run Javascript unit tests
      - run: yarn test

      # Code Climate coverage, split for parallel nodes
      - run: ./cc-test-reporter format-coverage --output "coverage/codeclimate.$CIRCLE_NODE_INDEX.json"
      - run: aws s3 sync coverage/ "s3://myapp/coverage/$CIRCLE_BUILD_NUM"

      # Run security scan
      - run: bundle exec brakeman

      # Save artifacts
      - type: store_test_results
        path: test/reports

      # `deploy` runs only on node 0 after parallel steps have finished
      # Upload results from all parallel nodes to Code Climate
      - deploy: 
          command: |
            aws s3 sync "s3://myapp/coverage/$CIRCLE_BUILD_NUM" coverage/ 
            ./cc-test-reporter sum-coverage --output - --parts $CIRCLE_NODE_TOTAL coverage/codeclimate.*.json | ./cc-test-reporter upload-coverage --input -