Here's Gitea's own comparison to GitHub's Actions: https://docs.gitea.com/usage/actions/comparison

Sure, it's not identical, and no one claims it is. I think it's defensibly like them, though.

We've run Gitea actions (and contributed here and there) for a couple of years, since-by-side with Github. We host in containers on the Gitea side so there are some marginal differences as to what can be run in a job, but our experience has been very positive.

Yes it is. It's not identical, but it is "like" it.