Binary release

[yasamoka]

First of all, thank you for your great work! It has provided tremendous value in testing code examples for a Book I am in the process of writing for an open-source project.

In my GitHub Actions workflow, I am pulling a pre-built mdbook binary by following this guide. However, mdbook-keeper has to be compiled from source.

Would you kindly provide a pre-built binary for the x86_64-unknown-linux-gnu target so that the GitHub-hosted runner can pull that binary instead in the same manner as mdbook?

Thank you again!