refactor: enhance exec command

Signed-off-by: thxCode <[email protected]>

Author: thxCode

gpustack_runtime/deployer/kuberentes.py

@@ -1566,7 +1566,7 @@ def __init__(self, ws: kubernetes.stream.ws_client.WSClient):
         super().__init__()
         self._ws = ws
         self._ws.run_forever(timeout=1)
-        # self._ws.write_stdin(self._ws.newline)
+        self._ws.write_stdin(b" \b")
 
     @property
     def closed(self) -> bool: