.circleci

   - restore_cache:
          keys:
            - recorder-{{ .Branch }}
          paths:
            - /caches/app.tar
    - run:
          name: Load Docker image layer cache
          command: |
            set +o pipefail
            docker load -i /caches/app.tar | true
    - run:
          name: Build application Docker image
          command: |
            cd recorder
            docker build --cache-from=app -t app .
    - run:
          name: Save Docker image layer cache
          command: |
            mkdir -p /caches
            docker save -o /caches/app.tar app
    - save_cache:
          key: recorder-{{ .Branch }}-{{ epoch }}
          paths:
            - /caches/app.tar