Comment by SideburnsOfDoom

> a CI isn't supposed to be a build system?

No. "Continuous Integration" is the practice of frequently merging changes to main. In this sense, "integration" means to take my changes and combine them with other recent changes.

A build and test system like those described in this article is a way to make CI safe and fast. It's not CI itself, it's just the enabling automation: the pre-merge checks and the post-merge artefact creation.