Use grub

builder/build-iso.sh

@@ -5,7 +5,7 @@ set -e
 # Note that these are packages installed to the Arch container used to build the ISO.
 pacman-key --init
 pacman --noconfirm -Sy archlinux-keyring
-pacman --noconfirm -Sy archiso git sudo base-devel jq
+pacman --noconfirm -Sy archiso git sudo base-devel jq grub
 
 # Setup build locations
 build_cache_dir="/var/cache"