playbook/roles/fstrim: Use generic cron instead of systemd timer

playbook/roles/fstrim/tasks/main.yml

@@ -4,20 +4,9 @@
     path: /sbin/fstrim
   register: fstrim
 
-- name: Install systemd files
-  template:
-    src: '{{ item }}'
-    dest: '/etc/systemd/system/'
-    owner: root
-    group: root
-    mode: 0644
-  with_items:
-    - fstrim.service
-    - fstrim.timer
-  when: fstrim.stat.exists
-
-- name: Enable fstrim timer
-  service:
-    name: fstrim.timer
-    enabled: true
+- name: Install cron for fstrim
+  cron:
+    name: fstrim
+    job: /sbin/fstrim -a
+    special_time: weekly
   when: fstrim.stat.exists