Add note about sssd

centos_rss/prod.packages.yml

@@ -18,4 +18,8 @@ packages:
   systemd:
   dbus:
   glibc:
+  sssd:
+    - feed: 'centos-8-.*'
+    - notes: |-
+        Waiting for a rebuild that fixes [#2148138](https://bugzilla.redhat.com/show_bug.cgi?id=2148138). Once it's there, remove `sssd` from [`packages_filtered.lst`](https://gitlab.cern.ch/linuxsupport/cronjobs/stream8_snapshots/-/blob/master/stream8_snapshots/packages_filtered.lst).