gitlab-ci: Run tests in verbose mode

Thus it's obvious what failed, if anything failed.
2 jobs for wip/mcrha/gitlab-ci-verbose-tests in 5 minutes and 16 seconds
Status Job ID Name Coverage
  Build
passed #1121911
debian-stable-x86_64

00:01:09

passed #1121910
fedora-x86_64

00:05:16