Define unprivileged Qwen image runtime user

platform/docker/qwen-image-worker/Dockerfile

@@ -10,6 +10,9 @@ RUN test -n "$COMFYUI_COMMIT" \
     && python -m pip install --break-system-packages --no-cache-dir \
        -r /opt/ComfyUI/requirements.txt \
     && apt-get purge -y --auto-remove git \
+    && groupadd --gid 10002 qwen-image \
+    && useradd --uid 10002 --gid 10002 --no-create-home \
+       --home-dir /nonexistent --shell /usr/sbin/nologin qwen-image \
     && rm -rf /var/lib/apt/lists/* /root/.cache
 
 WORKDIR /opt/ComfyUI