Add example .env configuration for ComfyUI

.env.example

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+# ComfyUI for DGX Spark (Blackwell GB10)
+# Based on nvidia/cuda:13.1.1-devel-ubuntu24.04 container
+# Customize your paths and rename this to .env
+# I suggest creating a comfyui folder in your home
+# Copy comfy_kitchen-0.2.7-cp312-abi3-linux_aarch64.whl in your /home/user/comfyui/wheel folder
+
+# Base path where your existing ComfyUI installation lives (for models)
+COMFYUI_HOST_PATH=/home/user/comfyui
+
+# Base path for ComfyUI data (custom_nodes, outputs, inputs, etc.)
+COMFYUI_DATA_PATH=/home/user/comfyui
+
+# ComfyUI settings
+COMFYUI_PORT=8188
+
+# Optimized flags for Grace-Blackwell unified memory architecture
+# Key: DON'T use --gpu-only - it fights the unified memory fabric
+# --disable-pinned-memory: reduces overhead on unified fabric
+# --force-fp16 + --fp16-*: enables Flash Attention optimization
+# --dont-upcast-attention: keeps attention in FP16 for speed
+# --disable-mmap: together with the patch in the Dockerfile fixes the double memory usage on unified memory on the Spark
+COMFYUI_FLAGS=--listen 0.0.0.0 --port 8188 --disable-pinned-memory --use-sage-attention --force-fp16 --bf16-unet --bf16-vae --bf16-text-enc --dont-upcast-attention --disable-mmap
+
+# Build refs (pin to specific commits/tags for reproducibility)
+COMFYUI_REF=master
+
+# ComfyUIMini - Mobile-friendly UI (optional)
+# Access at http://<host>:3000
+COMFYUIMINI_PORT=3000
+COMFYUIMINI_REF=main