add matrix_synapse_user_directory_exclude_remote_users var

roles/custom/matrix-synapse/defaults/main.yml

@@ -565,6 +565,7 @@ matrix_synapse_include_profile_data_on_invite: true
 # User search behaviour
 matrix_synapse_user_directory_search_all_users: false
 matrix_synapse_user_directory_prefer_local_users: false
+matrix_synapse_user_directory_exclude_remote_users: false
 
 # Controls whether people with access to the homeserver can register by themselves.
 matrix_synapse_enable_registration: false

roles/custom/matrix-synapse/templates/synapse/homeserver.yaml.j2

@@ -2646,6 +2646,9 @@ user_directory:
     #
     prefer_local_users: {{ matrix_synapse_user_directory_prefer_local_users | to_json }}
 
+    # If set to true, the search will only return local users. Defaults to false.
+    exclude_remote_users: {{ matrix_synapse_user_directory_exclude_remote_users | to_json }}
+
 
 # User Consent configuration
 #