fix: switch to non-root user before running model download script

Dockerfile

@@ -25,12 +25,12 @@ RUN pip install --no-cache-dir -r requirements.txt
 # Copy the rest of the application files
 COPY --chown=user:user . .
 
-# Run the model download script during build so the space starts up instantly
-RUN python download_model.py
-
 # Switch to the non-root user
 USER user
 
+# Run the model download script during build so the space starts up instantly
+RUN python download_model.py
+
 # Expose the default Hugging Face Space port
 EXPOSE 7860