ci: build rpm packages on ubuntu 22.04

On ubuntu-latest (24.04), for some reason it's not possible
to use sudo in fedora container running on top of ubuntu 24.04 runner.

Author: muzarski

.github/workflows/pkg.yml

@@ -12,7 +12,7 @@ env:
 jobs:
   build-rpm-pkgs:
     name: Build rpm packages
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     container:
       image: fedora:latest
       # Required by `mock`: