feat(docker): add nodes config build arg for custom workers

[eliteprox]

This PR adds a NODES_CONFIG build arg to Dockerfile.base to enable ComfyStream BYOC worker builds targeting different sets of custom nodes. A new --config flag was added to setup_nodes.py and setup_models.py to configure the environment

The feature is used to implement ComfyUI-StreamDiffusion using configs/nodes-streamdiffusion.yaml

Build with custom config from configs directory

base image

docker build -f docker/Dockerfile.base \
  --build-arg NODES_CONFIG=nodes-streamdiffusion.yaml \
  -t livepeer/comfyui-base:streamdiffusion .

comfystream image

docker build -f docker/Dockerfile \
 --build-arg BASE_IMAGE=livepeer/comfyui-base:streamdiffusion  \
  -t livepeer/comfystream:streamdiffusion .

[eliteprox]

Changes need testing as built docker container running as a server. Model downloads and engine builds should go to the paths expected by the example ComfyUI workflow. Example workflow to be added

[eliteprox]

Models download uses PixelArtRedmond15V-PixelArt-PIXARFK.safetensors, but example workflow uses PixelArt.safetensors

[eliteprox]

Engine builds are needed in entrypoint.sh. Parameters should match with the suggested example workflow, which should also be added.

[eliteprox]

@RUFFY-369 We might need to find a way to link nodes and model/engine configs since. --build-engines fails currently when built as a default container (nodes.yaml)

Engine for DepthAnything2 (large) already exists at /workspace/ComfyUI/models/tensorrt/depth-anything/depth_anything_v2_vitl-fp16.engine, skipping...
Engines for FasterLivePortrait already exists, skipping...
Building StreamDiffusion TensorRT engines using config: /workspace/ComfyUI/custom_nodes/ComfyUI-StreamDiffusion/configs/sd15_singlecontrol.yaml
python: can't open file '/workspace/ComfyUI/custom_nodes/ComfyUI-StreamDiffusion/scripts/build_tensorrt_engines.py': [Errno 2] No such file or directory
elite@elite4:~$

[eliteprox]

Updated with comments here to allow for quick editing to test images other than livepeer/comfyui-base:latest

This was needed because devcontainer build failed with livepeer/comfyui-base:streamdiffusion as the BASE_IMAGE name.

[RUFFY-369]

LGTM