Rename file names and references to those files

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

roles/custom/matrix-bridge-postmoogle/tasks/validate_config.yml

@@ -0,0 +1,12 @@
+---
+
+- name: Fail if required Postmoogle settings not defined
+  ansible.builtin.fail:
+    msg: >-
+      You need to define a required configuration setting (`{{ item.name }}`).
+  when: "item.when | bool and vars[item.name] == ''"
+  with_items:
+    - {'name': 'matrix_postmoogle_password', when: true}
+    - {'name': 'matrix_postmoogle_container_network', when: true}
+    - {'name': 'matrix_postmoogle_homeserver', when: true}
+    - {'name': 'matrix_postmoogle_database_hostname', when: "{{ matrix_postmoogle_database_engine == 'postgres' }}"}