Add Gitlab CI file

Gitlab ci added properly.
Moving the tickek to RTBC.

acbramley → closed merge request !24

Good to have GitlabCI setup, but shouldn't we work on making the tests green?

@szeidler of course, but you can't run tests without gitlab CI and there's no reason to hold back the issue on failing tests.

Automatically closed - issue fixed for 2 weeks with no activity.