Update Dockerfile

Dockerfile

@@ -23,7 +23,7 @@ COPY backend/package.json backend/package-lock.json ./backend/
 RUN cd backend && npm install
 
 # Copy the React build files from Stage 1 to the backend/build folder
-COPY --from=build /app/frontend/build ./backend/build
+COPY --from=build /app/frontend/dist ./backend/build
 
 # Copy the backend source code
 COPY backend ./backend