Gitlab CI + App Engine

.gitlab-ci.yaml

image: google/cloud-sdk:latest

stages:
  - deploy

####################################################################################################
# DEPLOY
#
.deploy_template: &deploy_template_def
  stage: deploy
  after_script:
    - rm /tmp/$CI_PIPELINE_ID.json


deploy_staging:
  <<: *deploy_template_def
  environment:
    name: staging
  only:
    - staging
  script:
    - echo $GOOGLE_APP_ENGINE_KEY_STAGING > /tmp/$CI_PIPELINE_ID.json
    - gcloud auth activate-service-account --key-file /tmp/$CI_PIPELINE_ID.json
    - gcloud config set project $GOOGLE_PROJECT_STAGING_ID
    - gcloud info
    - gcloud --quiet app deploy

deploy_production:
  <<: *deploy_template_def
  environment:
    name: production
  when: manual
  only:
    - master
  script:
    - echo $GOOGLE_APP_ENGINE_KEY_PRODUCTION > /tmp/$CI_PIPELINE_ID.json
    - gcloud auth activate-service-account --key-file /tmp/$CI_PIPELINE_ID.json
    - gcloud config set project $GOOGLE_PROJECT_PRODUCTION_ID
    - gcloud info
    - gcloud --quiet app deploy