feat: added cron task for prune docker system

defaults/main.yml

@@ -17,3 +17,5 @@ experimental_enable: "{{ metrics_enable }}"
 tcp_listen: false
 live_restore: true
 swarm_init: false
+
+docker_cronjob_prune: true

tasks/config.yml

@@ -17,4 +17,14 @@
   notify:
     - restart docker service
 
+- name: Schedule Docker system prune at 0:00 every day
+  ansible.builtin.cron:
+    name: "Daily Docker system prune"
+    user: "root"
+    job: "docker system prune -af --volumes"
+    special_time: "daily"
+    hour: "0"
+    minute: "0"
+  when: docker_cronjob_prune
+
 - meta: flush_handlers