Got recently bumped for an opt-in quirk added to grub-mkrescue to
support installing the secure boot shim on our ISO.
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
earlier this was part of another repo, now it's separate and there is
just one package anymore, so use the correct DEB variable to refer to
the binary debian packages that get build.
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>