pass results from depends commands to root command about lets HOT 1 OPEN

commands:
  build-image:
    persist_checksum: true
    checksum: &build-image-checksum
      - requirements.txt
    cmd: docker build -t img:${LETS_CHECKSUM} -f Dockerfile .

  unpack-container:
    depends: [build-image]
    checksum: *build-image-checksum
    persist_checksum: true
    cmd: |
      if [[ ${LETS_CHECKSUM_CHANGED} = true ]]; then
        cid=`docker create img:${LETS_CHECKSUM}`;
        docker cp ${cid}:/usr/ ./local/usr
        docker rm ${cid}
      fi