Explicit ssl certs for muc component

roles/prosody/templates/prosody.cfg.lua.j2

@@ -153,6 +153,10 @@ Component "conference.jabber.{{ domain }}" "muc"
     "muc_mam";
     "vcard_muc";
   }
+  ssl = {
+    key = "/etc/credentials/public/{{ domain }}/privkey.pem";
+    certificate = "/etc/credentials/public/{{ domain }}/fullchain.pem";
+  }
   max_history_messages = 500;
   muc_room_default_public = false;
   muc_room_default_persistent = true;