Super tiny add test_soft_watchdog to nightly (#15692)

test/registered/debug_utils/test_soft_watchdog.py

@@ -5,6 +5,7 @@ import requests
 
 from sglang.srt.environ import envs
 from sglang.srt.utils import kill_process_tree
+from sglang.test.ci.ci_register import register_cuda_ci
 from sglang.test.test_utils import (
     DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
     DEFAULT_URL_FOR_TEST,
@@ -12,6 +13,8 @@ from sglang.test.test_utils import (
     popen_launch_server,
 )
 
+register_cuda_ci(est_time=120, suite="nightly-1-gpu", nightly=True)
+
 
 class BaseTestSoftWatchdog:
     env_override = None