feat: add borg compact run once a month

ansible/group_vars/all/backup.yml

@@ -10,6 +10,9 @@ borgmatic_relocated_repo_access_is_ok: true
 borgmatic_cron_lines:
   - '0 2 * * * root borgmatic -c /etc/borgmatic/borg_local_repo'
   - '0 3 * * * root borgmatic -c /etc/borgmatic/borg_remote_repo'
+  - '0 12 1 * * root borgmatic compact /etc/borgmatic/borg_local_repo'
+  - '0 17 1 * * root borgmatic compact /etc/borgmatic/borg_remote_repo'
+
 borgmatic_hooks:
   before_backup:
     - echo "$(date) - Starting backup of {{ ansible_host }}"