Mount encrypted LUKS USB in Qubes 3.2

Mount encrypted LUKS USB for backup, etc in sys-usb:

Create mount point, unlock the encrypted device and mount the disk:

[user@sys-usb ~] sudo mkdir /mnt/usb
[user@sys-usb ~] udisksctl unlock -b /dev/sda1
[user@sys-usb ~] udisksctl mount -b /dev/dm-1