Use sso for single-sign-on cert test

TRIGGER_JOBS=ci-test-image-build

test/pytest/test_certs.py

@@ -99,7 +99,7 @@ def test_cert_validation(host, app): # pylint: disable=too-many-statements
         # prometheus is only exposed if opted-in in the settings
         'prometheus': 'prometheus',
         'rocketchat': 'chat',
-        'single-sign-on': 'admin',
+        'single-sign-on': 'sso',
         'wordpress': 'www'
     }