Add docker-registry class and bump mirror submodule

Change-Id: Iac7b68c3e6d9e0b8be66406e09aa6b01100812ed
diff --git a/classes/cluster/mcp-offline/infra/config.yml b/classes/cluster/mcp-offline/infra/config.yml
index fe9219d..9ed330f 100644
--- a/classes/cluster/mcp-offline/infra/config.yml
+++ b/classes/cluster/mcp-offline/infra/config.yml
@@ -10,6 +10,7 @@
 - cluster.mcp-offline.infra
 - system.linux.system.repo.docker_legacy
 - cluster.mcp-offline.infra.mirror
+- cluster.mcp-offline.infra.mirror.docker-registry
 
 parameters:
   _param: