Add bootupd integration

This does what we should have done originally, and copies the
bootupd bits directly from
https://github.com/coreos/fedora-coreos-config/blob/testing-devel/manifests/bootupd.yaml

And uses them via includes.

bootupd.yaml

@@ -0,0 +1,14 @@
+# KEEP THIS IN SYNC WITH https://github.com/coreos/fedora-coreos-config/blob/testing-devel/manifests/bootupd.yaml
+# Integration with https://github.com/coreos/bootupd
+# xref https://github.com/coreos/fedora-coreos-tracker/issues/510
+packages:
+  - bootupd
+
+postprocess:
+  - |
+    #!/bin/bash
+    set -xeuo pipefail
+    # Until we have https://github.com/coreos/rpm-ostree/pull/2275
+    mkdir -p /run
+    # Transforms /usr/lib/ostree-boot into a bootupd-compatible update payload
+    /usr/bin/bootupctl backend generate-update-metadata /

fedora-common-ostree.yaml

@@ -5,6 +5,11 @@ mutate-os-release: "38"
 
 include: fedora-common-ostree-pkgs.yaml
 
+# See https://github.com/coreos/bootupd
+arch-include:
+  x86_64: bootupd.yaml
+  aarch64: bootupd.yaml
+
 packages:
   - git-core
   - lvm2
@@ -50,7 +55,6 @@ check-groups:
 default_target: graphical.target
 
 packages-aarch64:
-  - bootupd
   - grub2-efi
   - ostree-grub2
   - efibootmgr
@@ -65,7 +69,6 @@ packages-ppc64le:
   - grub2
   - ostree-grub2
 packages-x86_64:
-  - bootupd
   - grub2-efi-ia32
   - grub2-efi-x64
   - grub2-pc