Merge branch 'add-ci-cleanup-gemfile' into 'master'

cleanup gemfile + introduce gitlab ci

See merge request !7
2 jobs for master in 4 minutes and 42 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
passed test #7754
container

00:02:06

 
  Prod Setup
passed prod_setup_check #7755
container

00:02:36