change env variable to explicit IS_DEPLOY_TO_CLOUD_RUN

Author: andrewlarimer

src/google/adk/cli/cli_deploy.py

@@ -39,6 +39,7 @@
 ENV GOOGLE_GENAI_USE_VERTEXAI=1
 ENV GOOGLE_CLOUD_PROJECT={gcp_project_id}
 ENV GOOGLE_CLOUD_LOCATION={gcp_region}
+ENV IS_DEPLOY_TO_CLOUD_RUN=1
 
 # Set up environment variables - End
 

src/google/adk/cli/fast_api.py

@@ -1103,7 +1103,7 @@ async def _get_a2a_runner_async() -> Runner:
         logger.info("Setting up A2A agent: %s", app_name)
 
         try:
-          if "K_SERVICE" in os.environ: # Indicating Cloud Run
+          if "IS_DEPLOY_TO_CLOUD_RUN" in os.environ:
             project_client = ProjectsClient()
             project_resource_path = project_client.get_project(name=f"projects/{os.getenv('GOOGLE_CLOUD_PROJECT')}").name
             project_number = project_resource_path.split('/')[-1]