add matrix_continuwuity_forbidden_remote_server_names variable

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

@@ -193,3 +193,5 @@ matrix_continuwuity_self_check_validate_certificates: true
 #   continuwuity_MAX_REQUEST_SIZE=50000000
 #   continuwuity_REQUEST_TIMEOUT=60
 matrix_continuwuity_environment_variables_extension: ''
+
+matrix_continuwuity_forbidden_remote_server_names: []

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

@@ -1164,7 +1164,7 @@ emergency_password = {{ matrix_continuwuity_config_emergency_password | to_json
 #
 # Basically "global" ACLs.
 #
-#forbidden_remote_server_names = []
+forbidden_remote_server_names = {{ matrix_continuwuity_forbidden_remote_server_names | to_json }}
 
 # List of forbidden server names that we will block all outgoing federated
 # room directory requests for. Useful for preventing our users from