Add gitlab pipeline yaml

7 jobs for master in 7 minutes and 47 seconds (queued for 1 second)
Status Job ID Name Coverage
  Clone
passed #203547
clone

00:01:58

 
  Build
passed #203548
build

00:02:27

 
  Test
passed #203551
autopkgtest

00:03:21

passed #203552
blhc

00:01:43

passed #203550
lintian

00:01:53

passed #203553
piuparts

00:02:25

passed #203549
reprotest

00:02:49