update ci script

tools/serving_build.sh

@@ -383,6 +383,7 @@ function python_test_multi_process(){
             echo "bert mutli rpc RPC inference pass"
             ;;
         GPU)
+            rm -rf ./image #TODO: The following code tried to create this folder, but no corresponding code was found
             check_cmd "python -m paddle_serving_server_gpu.serve --model uci_housing_model --port 9292 --workdir test9292 --gpu_ids 0 &"
             check_cmd "python -m paddle_serving_server_gpu.serve --model uci_housing_model --port 9293 --workdir test9293 --gpu_ids 0 &"
             sleep 5