publishing: check if the current version is already there or not

[sylvestre]

This can happen when a publishing step failed

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/tail/retry. tests/tail/retry is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/tail/symlink. tests/tail/symlink is passing on 'main'. Maybe you have to rebase?

[cakebaker]

The code itself looks fine. I'm not sure about the API access because according to https://crates.io/data-access they allow "[a] maximum of 1 request per second" and so I guess we could run into this restriction.

[tertsdiepraam]

I'd like to explore external tools for this process as well, but I think we can discuss that in another issue.

[sylvestre]

Having worked with @Gankra before, I am sure https:/axodotdev/cargo-dist is an excellent candidate for this :)

[tertsdiepraam]

I love everything this axo does, but I don't think cargo-dist is the full solution here. They even say in the docs that some steps should be left to cargo-release (https://opensource.axo.dev/cargo-dist/book/workspaces/cargo-release-guide.html). I'd still love to try out cargo-dist though! Especially with all the talk around Windows installers recently.