Remove some hardcoded matrix-postgres references

roles/custom/matrix-bot-honoroit/defaults/main.yml

@@ -43,7 +43,7 @@ matrix_bot_honoroit_sqlite_database_path_in_container: "/data/bot.db"
 
 matrix_bot_honoroit_database_username: 'honoroit'
 matrix_bot_honoroit_database_password: 'some-password'
-matrix_bot_honoroit_database_hostname: 'matrix-postgres'
+matrix_bot_honoroit_database_hostname: ''
 matrix_bot_honoroit_database_port: 5432
 matrix_bot_honoroit_database_name: 'honoroit'
 

roles/custom/matrix-bot-honoroit/tasks/validate_config.yml

@@ -1,10 +1,11 @@
 ---
 
-- name: Fail if required settings not defined
+- name: Fail if required honoroit settings not defined
   ansible.builtin.fail:
     msg: >-
-      You need to define a required configuration setting (`{{ item }}`).
-  when: "vars[item] == ''"
+      You need to define a required configuration setting (`{{ item.name }}`).
+  when: "item.when | bool and vars[item.name] == ''"
   with_items:
-    - "matrix_bot_honoroit_password"
-    - "matrix_bot_honoroit_roomid"
+    - {'name': 'matrix_bot_honoroit_password', when: true}
+    - {'name': 'matrix_bot_honoroit_roomid', when: true}
+    - {'name': 'matrix_bot_honoroit_database_hostname', when: "{{ matrix_bot_honoroit_database_engine == 'postgres' }}"}