[systemd-boot] Add ability to persistently set-oneshot when using @saved

[micha4w]

Component

bootctl

Is your feature request related to a problem? Please describe

Have to dualboot windows because Work, use @saved because nice, run systemctl --reboot --boot-loader-entry=auto-windows (or bootctl set-oneshot auto-windows). Am now on windows, windows decides to do a system update and restarts, I am now back in Linux, the update was not completed.

Describe the solution you'd like

You could change the behavior of the last boot not being changed when using Oneshot. But there's probably a reason for it to work this way:

systemd/src/boot/efi/boot.c

Line 2464 in eb1ec9c

/* Do not save or delete if this was a oneshot boot. */

But a command would be cool that sets the LoaderEntryLastBooted Variable. Something like bootctl set-oneshot --persist or bootctl set-savedboot.

I can make a PR if the idea is likeable.

Describe alternatives you've considered

My own small script that sets the LoaderEntryLastBooted EFI Variable.

The systemd version you checked that didn't have the feature you are asking for

255