Handy sidekick.nvim config for using custom models with copilot cli

GitHub Copilot CLI can work with custom models, but switching between these in an active session is not possible. This will hopefully be fixed soon, but in the meantime here's a decent-ish workaround I have in my Sidekick.nvim configuration. I'm currently testing Regolo.ai to see if working with European LLM inference would be a valid substitute for GitHub Copilot business subscriptions. I've been…