add matrix_continuwuity_forbidden_remote_room_directory_server_names variable

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

@@ -194,4 +194,5 @@ matrix_continuwuity_self_check_validate_certificates: true
 #   continuwuity_REQUEST_TIMEOUT=60
 matrix_continuwuity_environment_variables_extension: ''
 
-matrix_continuwuity_forbidden_remote_server_names: []
+matrix_continuwuity_forbidden_remote_server_names: []
+matrix_continuwuity_forbidden_remote_room_directory_server_names: []

roles/custom/matrix-continuwuity/templates/continuwuity.toml.j2

@@ -1170,7 +1170,7 @@ forbidden_remote_server_names = {{ matrix_continuwuity_forbidden_remote_server_n
 # room directory requests for. Useful for preventing our users from
 # wandering into bad servers or spaces.
 #
-#forbidden_remote_room_directory_server_names = []
+forbidden_remote_room_directory_server_names = {{ matrix_continuwuity_forbidden_remote_room_directory_server_names | to_json }}
 
 # Vector list of IPv4 and IPv6 CIDR ranges / subnets *in quotes* that you
 # do not want continuwuity to send outbound requests to. Defaults to