github: try to make token generation more robust against bad connection

[MichaelMure]

No description provided.

[akhavr]

Sometimes it fails even earlier:

Select option: 1
Github login: akhavr
Error: Get "https://api.github.com/users/akhavr": read tcp 192.168.1.193:52634->140.82.121.6:443: read: connection reset by peer

Will play more with the bridge creation trying to catch most failure modes.

[smoyer64]

Should we adopt something like backoff? (https://pkg.go.dev/github.com/cenkalti/backoff/v4). This is probably not the only place that would benefit from retries. We should also output a warning if the users GITHUB_TOKEN isn't valid (has expired, etc) since you technically have a token but you're still rate-limited like an unauthorized user.