Can chip-seq-pipeline2 run locally without internet?

[cyz0315]

I tried to run pipeline on cluster without internet connection, with local docker. But this error:
requests.exceptions.ConnectionError: HTTPSConnectionPool(host='github.com', port=443): Max retries exceeded with url: /broadinstitute/cromwell/releases/download/82/womtool-82.jar

I run by:
caper run /data/home/cheyizhuo/opt/encode/chip-seq-pipeline2/chip.wdl -i /data/home/cheyizhuo/MeCP2_HuangChen/mycode/data_process/chip/jsons/chip_MeCP2-IPS.json --singularity encodedcc/chip-seq-pipeline:v2.2.1 -b "local" -m ./chip_MeCP2-IPS.json --max-concurrent-tasks 2 --local-out-dir /data/home/cheyizhuo/opt/encode/chip-seq-pipeline2/local_for_caper/

[hitz]

I think you need an internet connection because the pipeline needs data/code from github.