Add Dockerfile for ComfyUI CPU-only build

Dockerfile

@@ -0,0 +1,18 @@
+FROM docker.io/library/python:3.13-slim
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git libgl1 libglib2.0-0 libsm6 libxext6 libgomp1 \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+RUN git clone --depth 1 https://github.com/comfyanonymous/ComfyUI . \
+    && pip install --no-cache-dir torch torchvision torchaudio \
+       --index-url https://download.pytorch.org/whl/cpu \
+    && pip install --no-cache-dir -r requirements.txt
+
+RUN useradd -u 1000 -m comfyui && chown -R 1000:1000 /app
+
+USER 1000
+EXPOSE 8188
+CMD ["python", "main.py", "--listen", "0.0.0.0", "--port", "8188", "--cpu"]