sync with previous repo

roles/matrix-registration/tasks/validate_config.yml

@@ -0,0 +1,20 @@
+---
+
+- name: Fail if required matrix-registration settings not defined
+  fail:
+    msg: >
+      You need to define a required configuration setting (`{{ item }}`) for using matrix-registration.
+  when: "vars[item] == ''"
+  with_items:
+    - "matrix_registration_shared_secret"
+    - "matrix_registration_admin_secret"
+    - "matrix_registration_server_location"
+
+- name: (Deprecation) Catch and report renamed settings
+  fail:
+    msg: >-
+      Your configuration contains a variable, which now has a different name.
+      Please change your configuration to rename the variable (`{{ item.old }}` -> `{{ item.new }}`).
+  when: "item.old in vars"
+  with_items:
+    - {'old': 'matrix_registration_docker_repo', 'new': 'matrix_registration_container_image_self_build_repo'}