[ISSUE] efibootmgr kernel hook does not create entry

[dkwo <dkwo@users.noreply.github.com>]

[-- Attachment #1: Type: text/plain, Size: 1446 bytes --]

New issue by dkwo on void-packages repository

https://github.com/void-linux/void-packages/issues/38533

Description:
### Is this a new report?

Yes

### System Info

Void 5.18.16_1 x86_64-musl GenuineIntel uptodate rrnDFFFFFFFFF

### Package(s) Affected

efibootmgr-18_1

### Does a report exist for this bug with the project's home (upstream) and/or another distro?

_No response_

### Expected behaviour

The kernel hook does the job of creating a new entry.

### Actual behaviour

No entry is created. This is from inside the installer chroot (both the working way and the broken one).

The package itself works if I use
`doas efibootmgr --disk /dev/nvme0n1 --part 1 --create --label "Void Linux with test kernel" --loader /vmlinuz-5.18.16_1 --unicode 'loglevel=4 rd.luks.name=809df427-d7d5-408c-a195-3be6e8681333=cryptroot root=/dev/mapper/cryptroot rd.luks.options=discard initrd=\initramfs-5.18.16_1.img' --verbose`

I'm using
```
$ cat /etc/default/efibootmgr-kernel-hook 
# Options for the kernel hook script installed by the efibootmgr package.
MODIFY_EFI_ENTRIES=1
# Kernel command-line options.
OPTIONS="loglevel=4 rd.luks.name=809df427-d7d5-408c-a195-3be6e8681333=cryptroot root=/dev/mapper/cryptroot rd.luks.options=discard"
# Disk where EFI Partition is.  Default is /dev/sda
DISK="/dev/nvme0n1"
# Partition number of EFI Partition.  Default is 1
PART=1
```

### Steps to reproduce

`xbps-reconfigure -f linux5.18`