Add scratch build with rpm-ostree fix for sbin merge as workaround

This will fix the ostree build tests on Rawhide and get rid of
all those failures. See:

https://gitlab.com/fedora/bootc/tracker/-/issues/29
https://bugzilla.redhat.com/show_bug.cgi?id=2337460
https://github.com/coreos/rpm-ostree/pull/5224

Signed-off-by: Adam Williamson <awilliam@redhat.com>

lib/utils.pm

@@ -475,7 +475,7 @@ sub get_workarounds {
     my %workarounds = (
         "40" => [],
         "41" => [],
-        "42" => [],
+        "42" => ["127874766"],
         "eln" => [],
     );
     my $advortasks = $workarounds{$version};