refactoring

roles/matrix-base/tasks/validate_config.yml

@@ -0,0 +1,9 @@
+---
+
+- name: Fail if required Matrix Base settings not defined
+  fail:
+    msg: >-
+      You need to define a required configuration setting (`{{ item }}`) for using this playbook.
+  when: "vars[item] == ''"
+  with_items:
+    - "matrix_homeserver_container_url"