Seems Gitlab are moving fairly fast (compared to competition) and going for that all in one ecosystem (If you want it) from SCM to deployment with the range of products they've introduced.
We are thinking big. The integrated Container Registry is part of our plan. We will soon have an integrated deployments with easy to access environments. We also plan to introduce manual actions on pipelines allowing you to execute arbitary things, ex. promote to production, but also merge it back to the master.
https://gitlab.com/gitlab-org/gitlab-ce/issues/17009 https://gitlab.com/gitlab-org/gitlab-ce/issues/17010