No, but I will try to incorporate the nixpkgs update script into it now that the metadata is fixed for the release. I’m not a nixpkgs maintainer (yet) though but usually this is close to automatic.
If you want, you can also submit and maintain the package, or I can put us both as maintainers
No,
Cargo.lock
is the only relevant optional one for Rust packages and that is already there, so we should be good. I’ll request it tomorrow if someone else doesn’t beat me to it ;)