Circle CI 2.0 building a node app and continuously deploying to Google App Engine

config.yml

version: 2
jobs:
  build:
    docker:
      - image: circleci/node:8.1
    working_directory: ~/web

    steps:
      - checkout

      # Download and cache dependencies
      - restore_cache:
          keys:
          - v1-dependencies-{{ checksum "package.json" }}
          # fallback to using the latest cache if no exact match is found
          - v1-dependencies-

      - run: npm install

      - save_cache:
          paths:
            - node_modules
          key: v1-dependencies-{{ checksum "package.json" }}
        
      # run tests!
      - run: npm run test

  deploy:
    docker: 
      - image: google/cloud-sdk

    working_directory: ~/web

    steps:
      - checkout

      - deploy:
          name: "Deploy to App Engine"
          command: |
            if [ "${CIRCLE_BRANCH}" == "master" ]; then
              ./.circleci/deploy.sh
            fi

workflows:
  version: 2
  build_and_deploy:
    jobs:
      - build
      - deploy:
          requires:
              - build

deploy.sh

#!/usr/bin/env bash
echo $GCLOUD_SERVICE_KEY | base64 --decode --ignore-garbage > ${HOME}/gcloud-service-key.json
gcloud auth activate-service-account --key-file ${HOME}/gcloud-service-key.json
gcloud --quiet config set project ${GOOGLE_PROJECT_ID}
gcloud --quiet config set compute/zone ${GOOGLE_COMPUTE_ZONE}
gcloud app deploy --quiet