Command issueserver is an Upspin server that serves GitHub issues.
To try it out, first create a GitHub Personal Access Token which which to access the GitHub API, giving it "repo" privileges. See: https://github.com/settings/tokens/new Put the token string (a string of hex digits) in the file $HOME/upspin/issueserver-github-token and run issueserver with upbox:
$ upbox -schema=issueserver.upbox
If all goes well, upbox will leave you in an 'upspin shell' session as firstname.lastname@example.org. Type 'ls' to look around.