feat: Run playbook test by cron to make sure it's still applicable to…

… few last Fedora versions.

.github/workflows/test.yml

@@ -1,6 +1,9 @@
 name: Ansible Playbook Test
 
 on:
+  schedule:
+    # Run once a month at midnight on the 1st of each month.
+    - cron: '0 0 1 * *'
   push:
     branches:
       - main