Fix user permission error in Dockerfile

Dockerfile

@@ -3,19 +3,18 @@
 
 FROM node:18-alpine
 
-# Set up user
-RUN adduser -D -u 1000 user
-USER user
-ENV PATH="/home/user/.local/bin:$PATH"
+# The node image already has a user named 'node' with UID 1000. We just need to switch to it.
+USER node
+ENV PATH="/home/node/.local/bin:$PATH"
 
 WORKDIR /app
 
 # Copy package files first for better caching
-COPY --chown=user package*.json ./
+COPY --chown=node package*.json ./
 RUN npm install
 
 # Copy all files
-COPY --chown=user . .
+COPY --chown=node . .
 
 # Hugging Face Spaces expose port 7860
 ENV PORT=7860