hey folks, fastest stack to go to production with supabase? My pre-supabase stack was cloudflare+next+github+some other stuff

Whatever you're most comfortable with will be the fastest option I'd say. For example, I'm most comfortable with Expo (React Native - iOS, Android and web) because I can iterate really quickly and add supabase-related functionality within a few hours for things like Auth (or a few minutes if it's something super simple like a table query), but wouldn't feel comfortable in Vue, Next or Angular because I don't work with those.

but what's the fastest, or what does supabase work the best with? or what has the most supabase ecosystem available?

There is no such stack, choose the stack you are most familiar with. I use SvelteKit, others have used NuxtJS while others have used NextJS. There is no such thing as the fastest stack.