Update Dockerfile

Dockerfile

@@ -16,7 +16,7 @@ RUN --mount=type=secret,id=PUBLIC_BACKEND_WS_URL,mode=0444,required=true \
  
 RUN npm run build --prefix frontend/
 
-FROM nginx:alpine
+FROM nginxinc/nginx-unprivileged:alpine
 COPY --from=build-frontend /app/frontend/build /usr/share/nginx/html
 
 # # Start a new stage using python:3.9-alpine