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this commit adds three environment variables:

- COMFYUI_FLUX: determines whether Flux is used, the workflow is completely different so this is necessary.
- COMFYUI_FLUX_WEIGHT_DTYPE: sets the weight precision for Flux. you will probably want to set this to "fp8_e4m3fn" as the fp16 weights take up about 24GB of VRAM. optional, defaults to "default".
- COMFYUI_FLUX_FP8_CLIP: Flux requires two CLIP models downloaded, one of which is available in fp8 and fp16. set to true if you are using the fp8 CLIP weights.

when running in different environments, the static_path is different.
This path is now 'determined' at runtime

Signed-off-by: José Luis Di Biase <josx@interorganic.com.ar>

fix the checking logic in function get_model_path()