I’m sorry @Faizan_Zahid , but you could really do better on that title. Maybe you meant “plugins” and not “Discourse”. Here I was expecting someone who was asking for a feature to remove Discourse from a server 
You want to be able to install/uninstall plugins without having to rebuild. Seems it’s not possible, unfortunately 
You would then want to minimize downtime when you need to rebuild. This has already been a subject lately: Help with “zero downtime” setup (which didn’t really go where it probably should have).
What we may need here, is a nice tutorial on how to setup a 2 web-container install and how to use it. This seems the most efficient setup (and also probably the most complicated one). I don’t have enough knowledge to do such a tutorial, or I would. Is there someone willing to ?