Automate release creation

[apjanke]

Use GitHub's API to automate release creation. Should draft the release and upload the artifacts. Then either pop it up in a web page for final approval, or just go ahead and release it.

References:

• https://docs.github.com/en/rest/reference/repos#releases
• https://docs.github.com/en/github/administering-a-repository/managing-releases-in-a-repository

This will require adding support for GitHub authentication keys somehow. That'll take some work.