Bug#1026915: grub-install --removable uses CD boot image instead of normal disk boot image

[Pascal Hambourg]

Package: grub-efi-amd64-bin
Version: 2.06-3~deb11u5
Tags: patch

When installing GRUB for UEFI secure boot, "grub-install --removable" 
uses the CD boot image gcd{arch}.efi.signed which is designed for CD 
boot and lacks encryption, LVM and RAID support. Such image cannot read 
/boot on LUKS, LVM or Linux RAID.

The attached patch uses the normal disk boot image grub{arch}.efi.signed 
instead. This is now possible because the normal disk image embeds a 
config file which searches grub.cfg in $prefix (/EFI/debian) then 
$cmdpath (/EFI/BOOT), instead of $prefix only in previous versions. IMO 
it would be better to reverse the order, cf. patch attached to bug #925309.
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