pipeline:

  build:
    image: alpine:edge
    commands:
      - sed -i 's@<VERSION>@${VERSION}@' Dockerfile

  docker:
    image: plugins/docker
    repo: bunix42/jekyll
    tags:
     - ${VERSION}
    secrets: [ docker_username, docker_password ]

matrix:
  VERSION:
    - 3.7.2
    - 3.8.6
    - 4.0.0