Watch GitHub and readthedocs builds in local release task

[jfhbrook]

The current release process involves running just tag and git push --tags, and then manually opening github actions and RTD to observe the release flows.

It would be cool to automatically poll those builds in a just release task. The gh CLI is probably capable. RTD does not appear to have a CLI, but it does have an API, so hacking one up is probably straightforward.