Containers are down while building

[LotharSee]

I'm using Gaudi as a way to centralize the configuration of all the containers I'm running (I only use custom type), and I often have to deploy a new container.

However, when I run gaudi to apply a change on a container (even small changes to the Dockerfile), it's going to stop and destroy all the containers during the build time.
I have many containers, so even if most of them exploit the cache, it takes around 30s to rebuild everything. Durin this period of time, all my system is down.

Then it would be nice to wait for containers to be built before removing the old ones.
Other idea: if the image hash is the same, no need to restart it.