WIP: tier-0/bootupd: Copy GRUB from new location in /usr

We should teach bootupd how to handle the new location for GRUB & Shim.
Workaround it until that happens.

See: https://gitlab.com/fedora/bootc/tracker/-/issues/61
See: https://fedoraproject.org/wiki/Changes/BootLoaderUpdatesPhase1

tier-0/bootupd.yaml

@@ -24,5 +24,9 @@ postprocess:
   - |
     #!/bin/bash
     set -xeuo pipefail
+
+    # Copy GRUB2 from new location to /usr/lib/ostree-boot
+    cp -a /usr/lib/grub2/*/EFI/fedora/* /usr/lib/ostree-boot/efi/EFI/fedora/
+
     # Transforms /usr/lib/ostree-boot into a bootupd-compatible update payload
     /usr/bin/bootupctl backend generate-update-metadata