The https://github.com/vyos/live-boot package is a fork of the Debian version containing some minor adjustments to mount the VyOS filesystems on boot and make the system usable.
The idea is if it's feasible to discontinue the package and rather use the Debian upstream version. The changes by VyOS required for the Debian package could possible then be added to https://github.com/vyos/vyos-build/tree/current/data/live-build-config/includes.chroot