You keep working since Git is decentralized.

You can also run a Forgejo instance (the software that powers Codeberg) locally - it is just a single binary that takes a minute to setup - and setup a local mirror of your Codeberg repo with code, issues, etc so you have access to your issues, wiki, etc until Codeberg is up and Forgejo (though you'll have to update them manually later).

As discussed elsewhere in this thread: They're under DDoS, and have been very public about this fact.