fix url

app.py

@@ -127,7 +127,7 @@ def build_agent(session_id:str,message:str) -> Agent:
         name="QueryResumeSearcher",
         description="Use it to search for a candidate with the query.",
         driver = GriptapeCloudStructureRunDriver(
-            base_url=os.getenv("BASE_URL"),
+            base_url=os.getenv("BASE_URL","https://cloud.griptape.ai"),
             structure_id=os.getenv("GT_STRUCTURE_ID"),
             api_key=os.getenv("GT_CLOUD_API_KEY"),
             structure_run_wait_time_interval=5,