Add the mayan_runtime option to the intercepted update_index command

apps/signaler/signals.py

@@ -1,5 +1,5 @@
 from django.dispatch import Signal
 
 pre_collectstatic = Signal()
-pre_update_index = Signal()
-post_update_index = Signal()
+pre_update_index = Signal(providing_args=['mayan_runtime'])
+post_update_index = Signal(providing_args=['mayan_runtime'])