Just like everyone else, I'll also recommend forgejo. But be prepared to handle bot traffic if you self-host it. My instance was hit almost constantly until I added strict rate limits, and made most of the stuff private. For a portfolio, I think Codeberg (or GitHub, that's where everyone looks for stuff) is better that self-hosting. But it can be good to keep a private instance for mirrors.

To add to the Forgejo circlejerk you can also self host it. It's managed by a democratic non-profit and has very active development. The UI is also pleasant to look at with nice diff/PR views.

The self hosting thing is a major safety point since if forgejo somehow fails in 10 years (I think it will be dominant in 10 personally) you can move to a self hosted instance with self hosted action runners. This makes it safe to move company accounts onto it but you might have issues with hard github dependency such as the github API or other organisation features.

Forgejo should be the first choice when looking for alternatives, although enterprise size companies should also consider Gitlab.

I'm not aware of any advantage of gitea over forgejo. I'm running the latter myself and I'm very happy.

Gitlab provides more corporate bling bling around the core git experience than forgejo but is also way heavier.

I'd check if jorgejo fulfils your needs.

Also in addition you could check out codeberg.org which runs forgejo and is a nonprofit - especially when it comes to recruiters a public facing entity might look better to someone who has no idea of self hosting.

I really enjoy forgejo though, it's just a very straight forward piece of software which does what's it advertising.

what format are your files in? if you want to show schematic previews from like gerber files i think you need something like a file store instead of git.

I like forgejo. Its a fork of ~~gitlab~~ gitea without the shenanigans. It has a lot of features and no tracking. Unless you want it too. And its lightweight