add get endpoint for container status

pr_agent/servers/azuredevops_server_webhook.py

@@ -107,6 +107,9 @@ async def handle_webhook(background_tasks: BackgroundTasks, request: Request):
         status_code=status.HTTP_200_OK, content=jsonable_encoder({"message": "webhook triggerd successfully"})
     )
 
+@router.get("/")
+async def root():
+    return {"status": "ok"}
     
 def start():
     app = FastAPI(middleware=[Middleware(RawContextMiddleware)])