make cron configurable

tasks/main.yml

@@ -48,8 +48,11 @@
   cron:
     name: Seafile Mirror Service
     job: "chronic pipx run seafile-mirror -c {{ seafile_mirror_dir }}"
-    hour: "23"
-    minute: "20"
+    minute: "{{ seafile_cron.minute }}"
+    hour: "{{ seafile_cron.hour }}"
+    day: "{{ seafile_cron.day }}"
+    month: "{{ seafile_cron.month }}"
+    weekday: "{{ seafile_cron.weekday }}"
 
 - name: Ensure user systemd directory exists
   file: