[4.0.x][Fixes GeoNode#10208] Add a custom hook at the end of the perm…

…issions assign (GeoNode#10212)

* [Fixes GeoNode#10208] Add a custom hook at the end of the permissions assign

geonode/geoserver/signals.py

@@ -42,6 +42,8 @@
 
 geofence_rule_assign = Signal(providing_args=["instance"])
 
+post_set_permissions = Signal(providing_args=['instance'])
+
 
 def geoserver_delete(typename):
     # cascading_delete should only be called if