[BUG] Unable to use model volume mappings

[Cirx08]

Issue:
If you have multiple containers that use the same models there is no way to use a common volume mappings between them.

Scenario:
If you use Flux.1 Dev model for ComfyUI, InvokeAI, AI Toolkit etc. I should be able to map a "Models" volumes to the path /root/ComfyUI/models which can also be mapped to other containers.

Expected:
The Flux.1 Dev model should be mapped from the volume.

Actual:
If a mapping is present the initial boot fails with an error stating the /root/ComfyUI directory already exists and is not empty resulting in the need to have duplicates of very large model files.

[ksullivan86]

I came looking for a solve for this as well, idk if we can use this somehow are not?https://github.com/comfyanonymous/ComfyUI/blob/master/extra_model_paths.yaml.example

I am not sure how to use this with the docker install