Trevor Gross 3353a891e3 Add tooling for josh syncs
Create a crate that handles pulling from and pushing to rust-lang/rust.
This can be invoked with the following:

    $ cargo run -p josh-sync -- rustc-pull
    $ RUSTC_GIT=/path/to/rust/checkout cargo run -p josh-sync -- rustc-push <username>
2025-06-04 18:06:15 +00:00
..