Not yet.
Right now we only support GitHub because of the authentication model it offers with JWTs. We’ll be expanding this to support publishing in other forges, and locally too.
There’s been some RFC work in that direction, and we’d like to see that happen, too. In the meantime, the proof of concept of FlakeHub took about a weekend to put together. The core concepts to implement what we have here is built in to Nix.