update validate_config.yml

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

@@ -8,3 +8,15 @@
   with_items:
     - { 'name': 'matrix_bot_chatgpt_openai_api_key', when: true }
     - { 'name': 'matrix_bot_chatgpt_matrix_bot_username', when: true }
+
+
+- name: Fail if OpenAI configuration not up-to-date.
+  ansible.builtin.fail:
+    msg: >-
+      Your configuration contains a varible that is no longer used.
+      Please change your configuration to remove the variable (`{{ item.name }}`).
+  when: "item.name in vars"
+  with_items:
+    - { 'name': 'matrix_bot_chatgpt_openai_email' }
+    - { 'name': 'matrix_bot_chatgpt_openai_password' }
+    - { 'name': 'matrix_bot_chatgpt_openai_login_type' }