Do not run the PackageKit tests on Fedora SilverBlue

2 jobs for <span class="ref-name">wip/hughsie/silverblue</span> in 15 minutes and 58 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #243388
build-gnome-software

00:15:58

failed #243325
build-gnome-software

00:37:51