Trigger builds of dependents projects when all tests of a project pass
Based on this dependency graph:
Once all the tests of a project passed, the tests of the projects depending on this are triggered to ensure that everything is green everywhere.
For now this is done using curl but once we'll move to a more recent version of gitlab-heptapod we'll be able to use this way better system: https://docs.gitlab.com/ee/ci/multi_project_pipelines.html