We've been looking at Forgejo too. Do you have any experience with Forgejo Actions you can share? That is one thing we are looking at with a little trepidation.
We use them in our shop. It's quite straightforward if you're already familiar with Github Actions. The Forgejo runner is tiny and you can build it even on unsupported platforms (https://code.forgejo.org/forgejo/runner) e.g. we've setup our CI to also run on Macs (by https://www.oakhost.net) for App Store related builds. It's really quite a joy :)
I setup actions yesterday. There are a few tiny rough edges, but it is definitely working for me. I'm using it to build my hugo blog which "sprinklylls" in a Svelte app, so it needs to have nodejs + hugo and a custom orchestrator written in Zig.
What I did: