As just discussed on the mailing list (see the thread starting at [1]),
the author of the thread would like to use the sysvinit init system
instead of systemd. We already provide an option for selecting this (`-
-initsystem`), however it does not work. All it achieves is to put a
different `live-config-*` package along with `sysvinit-core` into a
live package list.

I expect that the reason why the author cannot build a sysvinit image
currently is because debootstrap is installing `systemd-sysv` and we do
nothing in our `boostrap_debootstrap` script to get debootstrap to
alternatively install `sysvinit-core` like the procedure described at
[2].

[1]: https://lists.debian.org/debian-live/2021/08/msg00014.html
[2]:
https://www.notinventedhere.org/articles/linux/debootstrapping-debian-jessie-without-systemd.html