install ComfyUI Manager when building the Comfy docker image

[nehemiascr]

Discussed in #686

Has this issue been opened before?

• It is not in the FAQ, I checked.
• It is not in the issues, I searched.

^{Originally posted by gl-prout April 24, 2024}
I have successfully installed ComfyUI and have cloned ComfyUI Manager's repo in stable-diffusion-webui-docker/data/config/comfy/custom_nodes

But when I restart ComfyUI, ComfyUI Manager responds with the module git missing, which makes sense, because ComfyUI Manager's python requirements are not installed within the image

Those are the said requirements as listed on their repo

GitPython
PyGithub
matrix-client==0.4.0
transformers
huggingface-hub>0.20

I do believe that I would need to modify either the entrypoint.sh or Dockerfile in stable-diffusion-webui-docker/services/comfy to add instructions to pip install those requirements, but I'm not sure where it would be the most appropriate, and the condition to see if ComfyUI Manager is there or not

We could just install in when building the comfy docker image