Enable "CI/CD for external repo"

Hi there,
I’ve been trying to enable the CI feature for external repos (like GitHub) using a CE edition (10.0.4 and 10.6) but seems like that option, which is described in the docs, would be only available for EE versions.

As far as you know, Is the “CI/CD for external repo” feature available on Gitlab CE? If so, how can I enable it?

Thanks a lot!