continuous integration has been a topic on any other platform for some years now. But on IBM i I never heard that term in any discussion.
There is a myriad of open source tooling support on any platform but not for IBM i ... or rather there is tooling for anything but for ILE on IBM i.
The central piece of software for CI is a build server which runs the build jobs but can also execute other tasks like unit and integration test and can also be used to automatically deploy the build to a test or integration environment. Jenkins is such a build server.
I have written an article about the results of my adventures with Jenkins and some RPG code. You can find it in my wiki.