Build ovn-sb-db-relay for stackhpc/master

Author: seunghun1ee

etc/kayobe/kolla-image-tags.yml

@@ -7,3 +7,6 @@ kolla_image_tags:
   openstack:
     rocky-9: master-rocky-9-20250213T114650
     ubuntu-noble: master-ubuntu-noble-20250213T091307
+  ovn-sb-db-relay:
+    rocky-9: master-rocky-9-20250305T111730
+    ubuntu-noble: master-ubuntu-noble-20250305T111730