version: 2

defaults: &defaults
  docker:
    # specify the version
    - image: circleci/golang:1.12.5

jobs:
  build:
    <<: *defaults
    steps:
      - checkout

      - restore_cache:
          keys:
            - cache-{{ arch }}-{{ .Branch }}-{{ checksum "go.sum" }}
            - cache-{{ arch }}-{{ .Branch }}
            - cache

      - run: make test

      - save_cache:
          key: cache-{{ arch }}-{{ .Branch }}-{{ checksum "go.sum" }}
          paths:
            - /go/pkg

  release:
    <<: *defaults
    steps:
      - checkout

      - setup_remote_docker
      - run: echo $DOCKER_PASSWORD | docker login -u $DOCKER_USER --password-stdin
      - run: make release

workflows:
  version: 2
  incremental:
    jobs:
      - build:
          filters:
            tags:
              ignore: /^\d+\.\d+\.\d+/
  release:
    jobs:
      - release:
          filters:
            tags:
              only: /^\d+\.\d+\.\d+(-\d+)?/
            branches:
              ignore: /.*/