vibecoded efi shim

catcoded and less cursed solution of the same problem for grub: eule-booter

1. install systemd-boot
2. install decider.efi
3. set decider.efi as default boot option
4. you can now set LoaderEntryOneShot on boot using a removable flash drive with DECIDER.CHO in its root

hint: the removable flash drive should be an esp32/rp2040 pretending to be a usb drive and serving the right file depending on some physical toggle state or whatever

todo:

• support other bootloaders (big maybe??? other bootloaders are smart enough to allow this out of the box, see eule-booter)
• learn some rust and see if this code is shit, do some refactoring (never?)

use case:

• remotely choose an OS to boot your PC into BEFORE it boots