Describe the feature or problem you’d like to solve

When I use gh auth login to login with the GitHub CLI OAuth app, I have to manually select and copy the one-time device code before launching the browser so I can paste it into the GitHub.com device login screen.

! First copy your one-time code: 7701-C5F6
Press Enter to open https://github.com/login/device in your browser... 

I'd like some way I can configure gh to use the clipboard for certain features like gh auth login.

Proposed solution

I can see 3 different ways to provide this ability depending on how broadly this capability might be extended:

1. Environment variable: GH_CLIPBOARD=1
2. Configuration setting: gh config set clipboard enabled
3. Command-specific flag: gh auth login --clipboard

Additional context

One of gh dependencies is already including a library for putting content into the system's copy buffer: