You could try gerrit + e.g. Jenkins. When pushing to review the CI can pick up the commit, build it and optionally run tests and give +1/-1 verified. The commi

You could try gerrit + e.g. Jenkins. When pushing to review the CI can pick up the commit, build it and optionally run tests and give +1/-1 verified. The commit is merged only after a developer will give +2 for the review.