message: Remove container after smoke test
diff: ```console
  $ cd $DOCKERFILE_DIR
  $ DOCKER_BUILDKIT=1 docker build -t intel-extension-for-pytorch:test .
  - $ docker run intel-extension-for-pytorch:test python -c "import torch;import intel_extension_for_pytorch as ipex;print('torch:', torch.__version__,' ipex:',ipex.__version__)"
  + $ docker run --rm intel-extension-for-pytorch:test python -c "import torch;import intel_extension_for_pytorch as ipex;print('torch:', torch.__version__,' ipex:',ipex.__version__)"
  ```
  