sync with previous repo

roles/matrix-coturn/tasks/validate_config.yml

@@ -0,0 +1,10 @@
+---
+
+- name: Fail if required Coturn settings not defined
+  fail:
+    msg: >-
+      You need to define a required configuration setting (`{{ item }}`) for using Coturn.
+  when: "vars[item] == ''"
+  with_items:
+    - "matrix_coturn_turn_external_ip_address"
+    - "matrix_coturn_turn_static_auth_secret"