Add gitlab-ci file

2 jobs for !16 with work/ci in 2 minutes and 41 seconds (queued for 1 second)
latest detached
Status Job ID Name Coverage
  Build
passed #48965
linux kf5-qt5 qt5.12

00:02:41

41.0%
passed #48966
linux kf5-qt5 qt5.13

00:02:38

41.0%