GitLab CI for firebase functions

.gitlab-ci.yml

image: node:12.13.0-alpine

before_script:
  - npm i -g firebase-tools

test-functions:
  stage: test
  script:
    - cd functions
    - npm install
    - firebase use <YOUR_PROJECT>
    - firebase functions:config:set fb.token=$FIREBASE_TOKEN
    - firebase functions:config:get > .runtimeconfig.json
    - cd test
    - npm run test
  only:
    refs:
      - master
    changes:
      - functions/**/*