Changes

jobs/master-builds: add ot290-gsmtap

This job didn't have a jenkins job builder config yet and ran without
docker on label=osmocom-master-debian10, which we are removing.

Related: https://jenkins.osmocom.org/jenkins/job/master-ot290-gsmtap/
Related: OS#6186
Change-Id: Iec1a07896dc2817f7671463ddba438b727f41b5d