Update customized live image weekly.

roles/edulive/tasks/main.yml

@@ -17,6 +17,16 @@
     dest: /usr/local/sbin/
     mode: 0755
 
+- name: provide service and timer for livebuilder
+  copy:
+    src: "{{ item }}"
+    dest: "/etc/systemd/system/{{ item }}"
+    mode: 0644
+  with_items:
+    - livebuilder.service
+    - livebuilder.timer
+  notify: "enable livebuilder.timer"
+
 - name: copy live-build configuration
   copy:
     src: "{{ item }}"