Investigate the use of systemd-firstboot

[nullr0ute]

Is your feature request related to a problem? Please describe.

While we have FDO and ignition for a lot of usecases they are both quite complex to deal with for first time users, in the past we've used initial-setup but that is being sunset, so we should investigate the use of systemd-firstboot and related tools

Describe the solution you'd like
The use of systemd-firstboot as a fallback to FDO and ignition

Describe alternatives you've considered
We can stay with zezere or consider initial-setup, there may be others.

Additional context
We need to make sure FDO, ignition and systemd-firstboot don't negatively affect each other