version: 2.1
orbs:
  rebar3: tsloughter/rebar3@0.6.3

jobs:
  ct:
    parameters:
      tag:
        description: The docker tag to use.
        type: string
        default: "21.2"
    executor:
      name: rebar3/erlang
      tag: <<parameters.tag>>
    steps:
      - checkout
      - rebar3/ct

workflows:
  build-test:
    jobs:
      - ct:
          name: "21"
          tag: "21.2"
      - ct:
          name: "20"
          tag: "20"
      - ct:
          name: "19"
          tag: "19"
      - ct:
          name: "18"
          tag: "18"