Build and deploy flow Gitlab CI/CD

.gitlab-ci.yml

stages:
  - test
  - build
  - deploy

test:
  stage: test
  script: echo "Running tests"
  tags:
  - lab


build:
  stage: build
  script: echo "Building the app"
  tags:
  - lab


deploy_staging:
  stage: deploy
  script:
    - echo "Deploy to staging server"
  environment:
    name: staging
    url: https://staging.example.com
  only:
  - master
  tags:
  - lab


deploy_prod:
  stage: deploy
  script:
    - echo "Deploy to production server"
  environment:
    name: production
    url: https://example.com
  when: manual
  only:
  - master
  tags:
    - lab