ci: Set custom release number for Packit

We want a high release number (99) for the daily builds done by
Packit to make sure the Copr daily builds are always newer than
the version in Fedora. We can do this in Packit config instead of
bumping the release in the spec everytime.

python-blivet.spec

@@ -5,7 +5,7 @@ Version: 2.0.2
 
 #%%global prerelease .b1
 # prerelease, if defined, should be something like .a1, .b1, .b2.dev1, or .c2
-Release: 2%{?prerelease}%{?dist}
+Release: 1%{?prerelease}%{?dist}
 Epoch: 1
 License: LGPL-2.1-or-later
 %global realname blivet