pipeline:

  docker:
    image: plugins/docker
    repo: bunix42/google-cloud-sdk
    build_args:
      - BASE_IMAGE=google/cloud-sdk:${VERSION}
      - KUBECTL_VERSION=${KUBECTL_VERSION}
      - HELM_VERSION=${HELM_VERSION}
    tags:
     - ${VERSION}_kubectl-${KUBECTL_VERSION}_helm-${HELM_VERSION}
    secrets: [ docker_username, docker_password ]
    when:
      branch: master

  slack:
    image: plugins/slack
    channel: drone
    username: drone
    secrets: [ slack_webhook ]

matrix:
  VERSION:
    - 193.0.0-alpine
  KUBECTL_VERSION:
    - v1.10.9
    - v1.11.3
    - v1.12.2
  HELM_VERSION:
    - v2.11.0