systemd_mount vars task example:

``` yaml
host_maintenance_disk_mounts:
    - source: /dev/disk/by-uuid/xxxxxxx
        target: /var/lib/rancher
        mount_type: ext4
        unit_before: k3s.service
        unit_conflicts: umount.target
        mount_options:
        - defaults
    - source: /dev/disk/by-uuid/xxxxx
        target: /var/lib/rancher/k3s/storage 
        unit_before: k3s.service
        unit_conflicts: umount.target
        mount_type: ext4
        mount_options:
        - defaults

```