Fix user creation in Dockerfile for HF Spaces

Dockerfile

@@ -30,8 +30,7 @@ FROM node:18-alpine AS production
 RUN apk add --no-cache dumb-init
 
 # Create user with UID 1000 as required by HF Spaces
-RUN addgroup -g 1000 -S user && \
-    adduser -S user -u 1000
+RUN adduser -S user -u 1000 -G root
 
 # Set working directory
 WORKDIR /app