mention debian/gitlab-ci.yml in changelog

5 jobs for debian/19.04-1 in 5 minutes and 55 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Build
passed #168170
build

00:02:46

 
  Test
passed #168173
autopkgtest

00:01:49

passed #168172
lintian

00:01:47

passed #168174
piuparts

00:03:08

passed #168171
reprotest

00:02:35