align borg and burp folders to backup, switch to systemd for scheduling

tasks/cron.yml

@@ -1,10 +1,16 @@
-- name: Deploy cronjob backup_tout_court
-  vars:
-    minutes: "{{ 59 | random(seed=inventory_hostname) }}"
-  cron:
-    name: backup
-    cron_file: backup
-    user: root
-    hour: "2"
-    minute: "{{ minutes }}"
-    job: "{{ borg_script_dir }}/borg.sh"
+- name: Deploy systemd service and timer unit files
+  ansible.builtin.template:
+    src: "{{ item }}"
+    dest: /etc/systemd/system/
+  notify: reload systemd
+  loop:
+  - borg_backup.service
+  - borg_backup.timer
+
+- ansible.builtin.meta: flush_handlers
+
+- name: enable and start timer
+  ansible.builtin.systemd:
+    name: borg_backup.timer
+    state: started
+    enabled: true