feat: add files for signalgo installation

roles/custom/matrix-bridge-mautrix-signalgo/tasks/validate_config.yml

@@ -0,0 +1,11 @@
+---
+
+- name: Fail if required mautrix-signalgo 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_mautrix_signalgo_appservice_token', when: true}
+    - {'name': 'matrix_mautrix_signalgo_homeserver_token', when: true}
+    - {'name': 'matrix_mautrix_signalgo_database_hostname', when: "{{ matrix_mautrix_signalgo_database_engine == 'postgres' }}"}