Private Gitlab(-CI), How to Get Kube Containers to See it?

I’ve got an all-in-one, bare-metal set-up running Gitlab, Gitlab-CI + Kubernetes cluster. Have a runner started, and connected - it gets the build job. But…

When the instantiated container tries to clone the repo, it can’t resolve the FQDN I’m using. How to tell the container how/where to reach the Gitlab server? Any pointers?