Add a manual trigger to build the package in this project
With https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11086 we have a manual trigger for building a pkg from the CE/EE repo.
We should be able to do the same from this repository as well.
This is a bit of a duplication because you can achieve the similar by pushing to dev.gitlab.org, however that is more complicated than just pressing a button.
Part of #2322 (closed)