Changes
/* GRUB EFI setup */
search search_fs_file search_fs_uuid search_label sleep tar terminal verify video_fb"
grub-mkstandalone -d /usr/lib/grub/x86_64-efi -O x86_64-efi --modules "$MODULES" --pubkey gpg.key --output grubx64.efi boot/grub/grub.cfg=grub.init.cfg boot/grub/grub.cfg.sig=grub.init.cfg.sig -v
### as result grubx64.efi will be created
* Sign grubx64.efi with your db key
sbsign --key db.key --cert db.crt grubx64.efi
### as result grubx64.efi.signed will be created ### this file , it will be your bootloader
== Prepare signed grub.cfg kernel and initrd on the EFI partition ==