Add debug task to display skip_reboot value and fix condition check for reboot

roles/maintenance/tasks/main.yml

@@ -15,9 +15,13 @@
   apt:
     autoclean: yes
 
+- name: Show skip_reboot value
+  debug:
+    var: skip_reboot
+
 - name: Reboot if tasks changed things
   reboot:
     msg: "Reboot triggered by Ansible after system changes."
   when: 
     - ansible_facts['pkg_mgr'] == "apt"
-    - skip_reboot is not defined or skip_reboot != true
+    - skip_reboot is not defined or skip_reboot != "true"