Note that gnutls 3.8.2 packages is still under testing, so we
tentatively pull in the build directly from koji.
Signed-off-by: Daiki Ueno <dueno@src.gnome.org>
Don't waste precious CI time reinstalling/upgrading packages.
Most of the scripts here were taken from GLib's CI scripts, but adjusted
to deal with dependencies that might change between branches rather than
different distros.
