OAuth device flow login

### What is the problem you're trying to solve

We should implement the OAuth device flow.
Docker shipped it a few days ago.

IIRC this is easy.

Anyone wants to take it?

### Describe the solution you'd like

Some generic info here (in the context of github): https://docs.github.com/en/apps/oauth-apps/building-oauth-apps/authorizing-oauth-apps#device-flow

More: https://oauth.net/2/device-flow/

### Additional context

_No response_