is the cache of Zed kept inside the container or is it mounted? Question is if I add/change twig files I need to recreate the container?

Cache shouldn't be in the container but this is not 100% sure answer.

@acoustic-vase-67265 The twig cache stuff does not depend on the infrastructure. So in docker setup you just need to run

docker/sdk console twig:cache:warmer

when you added new twig template. And no need to restart docker container in dev mode.