Add publish.rs to top-level workspace

[cratelyn]

Today, we have a helper script to check that all of the packages in the workspace are publishable. This script was heavily inspired from a similar facility in wasmtime, which goes out of its way to avoid incurring any dependencies.

In conversation with @aturon however, we agreed that there are some benefits to allowing dependencies to exist. For example, the code used to parse out the Cargo.toml manifest is a bit ungainly. Additionally, we can use something like clap to handle parsing out command-line options.

[mgattozzi]

@cratelyn I'm going through and triaging issues and I think we can close this one given we have the script available. Is that correct or is there more functionality we want here?

https://github.com/fastly/Viceroy/blob/main/scripts/publish.rs

[cratelyn]

i'm content to close this. while the issue itself isn't addressed, this is a very low priority and probably not worth the effort today.