Plugin won't load: error installing counterfit

[lilyjw]

Describe the bug
Arsenal plugin errors on installing counterfit

To Reproduce
Steps to reproduce the behavior:

Set up caldera-atlas:

1. git clone --recursive https://github.com/mitre-atlas/caldera-atlas
   If one has SSH keys uploaded, this should check out all submodules.
   Otherwise, there may be failures because some submodules have SSH URLs. To resolve:
   a. git checkout https to get the branch with HTTPS URLs
   b. git submodule sync --recursive && git submodule update --init

2. docker-compose build
   If one gets an error about python3-venv not being found, add python3-venv to the list of packages installed by CALDERA itself - edit the RUN apt-get ... step in the caldera/Dockerfile, then re-run docker-compose build

The services stay up, but upon visiting localhost:8888, Arsenal is not in the list of plugins and there is an error in the service start:

From the Docker container log of CALDERA (the caldera-atlas service):

ERROR (c_plugin.py:70 enable) Error enabling plugin=arsenal, Command '['/root/venv/cf_venv/bin/python3', '-m', 'pip', 'install', 'counterfit[dev] @ git+https://github.com/Azure/counterfit.git@main']' returned non-zero exit status 1.

Expected behavior
Arsenal plugin loads without error and appears in the CALDERA sidebar.

Desktop (please complete the following information):
Ubuntu 22.04 but running CALDERA as a container using its own Dockerfile, which uses ubuntu:latest