feat: Add github workspace command

[deathbeam]

Supports resolving github code index workspace data and searching in it

TODO: Currently this api do not accepts ghu_ github copilot token, and I need to use gh cli instead that creates hosts.yml

https://github.blog/engineering/the-technology-behind-githubs-new-code-search/

[ruicsh]

this would be awesome, do you expect it to be possible?

[deathbeam]

Well it already works just the separate token is annoying. I was thinking of instead adding it as example as custom context to discussions for now