Add proper ssh sync attribute key for tests

config/gitlab.yml.example

@@ -330,6 +330,6 @@ test:
         user_filter: ''
         group_base: 'ou=groups,dc=example,dc=com'
         admin_group: ''
-        sync_ssh_keys
+        sync_ssh_keys: sshpublickey
 staging:
   <<: *base