A very rough POC of a GitHub Copilot Extension using OpenSauced that leverages the GitHub Copilot SDK Preview.
Better instructions eventually, but for now:
npm install
npm run dev
open http://localhost:3000
Use tunneling to expose your localhost to the internet via VS Code's Port forwarding, ngrok, or similar.
You'll need to create a GitHub app for the Copilot extension to work and use the URL from the from the tunneling above in your GitHub app configuration.
Check out https://github.blog/news-insights/product-news/introducing-github-copilot-extensions/ for more info.