Update permision docker file

Dockerfile

@@ -17,7 +17,12 @@ RUN pip install --no-cache-dir -r requirements.txt
 COPY . .
 
 # Create directory for model files
-RUN mkdir -p /app/models
+RUN mkdir -p /app/models /tmp/models && \
+    chown -R appuser:appuser /app && \
+    chmod -R 755 /app
+
+# Switch to non-root user
+USER appuser
 
 # Expose port
 EXPOSE 7860