Ubuntu aarch64 builds

I'm using the watchman `x86_64` binaries [in a project](https://github.com/thoughtpolice/buck2-nix/blob/main/buck/nix/buck2/watchman.nix#L20) with Sapling and Buck, and having success. But using it on my Asahi Linux laptop, I need to patch out use of watchman, due to the lack of aarch64 binaries.

So, I'd like to request aarch64 release builds of watchman if possible. Ideally, Ubuntu 22.04 builds, since that will be built with a more recent glibc; plus, aarch64 is relatively new so that will likely be the most well supported toolchain, I suspect.

I think the current builds are created with GitHub Actions, which complicates things I suspect...