Example Drone file

.drone.yml

pipeline:
  install:
    image: node:6.13
    commands:
      - npm install
      
  test:
    image: node:6.13
    commands:
      - npm test

  deploy:
    image: hashicorp/terraform
    commands:
      - cd ./terraform
      - terraform apply -auto-approve
    when:
      branch: master