ci: Enable sources repositories for Ubuntu job

6 jobs for gnome-3-30 in 17 minutes and 13 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #128983
flatpak:app

00:08:41

 
  Test
passed #128984
flatpak:tests

00:04:59

 
  Review
passed #128985
review

00:00:21

manual #128986
allowed to fail manual
stop_review
 
  Cross Distro
passed #128987
fedora:29

00:03:11

passed #128988
ubuntu:devel

00:02:24