gitlab CI: add a basic build test

Based on the config from libX11

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
3 jobs for master in 2 minutes and 53 seconds (queued for 9 seconds)
Status Name Job ID Coverage
  Prep
passed container-prep #13911820

00:01:27

 
  Build
passed build #13911821

00:00:47

 
  Deploy
passed check-merge-request #13911822

00:00:38