Run `meson test` on GitLab CI

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>
1 job for master in 17 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
failed #7854
test

00:00:17

 
Name Stage Failure
failed
test Test
Reading package lists...
Building dependency tree...
Reading state information...
1 package can be upgraded. Run 'apt list --upgradable' to see it.
Reading package lists...
Building dependency tree...
Reading state information...
E: Unable to locate package sharness
ERROR: Job failed: exit code 1