The @gitlab integration on http://drupal.org has improved a lot recently. Core testing is now twice as fast as the legacy custom DrupalCI testing system (https://drupal.org/i/3375826). There is also direct visibility and access to gitlab CI results on project pages.
Drupal - Open Source CMS

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Drupal.org

@dropismoving @gitlab

How do you get that badge to show??

@jon @gitlab in this case the 5.x version of devel module has their GitLab CI setup configured. As of July all contributed projects can do that :) https://www.drupal.org/association/blog/gitlab-ci-is-now-enabled-for-every-project-hosted-on-drupalorg -- the badge is new but should be automatically showing.
GitLab CI is now enabled for every project hosted on Drupal.org

Are you a project maintainer on Drupal.org? You can now use GitLab CI to manage your testing.

Drupal.org

@dropismoving @gitlab

Ohh I know why now... I'm not actually running gitlab CI on my project. 😆

Site.module is a subtree split, I almost forgot.