Yeah, but ooh boy is a private gitlab server complicated. Omnibus installation helps manage that, but if you outgrow it you're in for a complicated time.

Also gitlab has cves like every other week... You're going to be on that upgrade train, unless you keep access locked down (no internet access!!) and accept the admittedly lower risk of a vulnerable gitlab server on your LAN/VPN network.

Even if gitlab is updated fully, you're fighting bot crawlers 24/7.