How can I get auto devops running on feature branches and merge requests?

I’m running auto devops in a new ruby on rails project. The main branch is running the automatic pipeline. However, new feature branches and merge requests are not running a pipeline. It was my understanding this would be the case. I’ve explicitly enabled auto devops for this project. It’s a self-hosted 14.7.

I believe I’ve read all of the auto devops docs, but I haven’t found anything that addresses this.