How to develop locally?

[glasser]

I found this linked from argoproj/argo-cd#15780 so it seems like it is intended as an example project for the cool new feature.

I'm curious how you actually iterate and develop it. Do you have any sort of local workflow or do you do it entirely via the install-extension script? If you don't have an extra non production copy of argocd running do you have suggestions on how to iterate and experiment without affecting production users (eg installing a second extension that is only enabled for apps with a certain annotation or something?)