Custom Image with docker

[vlnrajesh]

I already having an container with most of the RUN commands which is getting executed by kitchen-docker/lib/kitchen/driver/docker.rb in addition to test-kitchen required packages.
Since these commands executes after my image layer loaded, it is getting duplicated and making TTL delay.
I would like disable steps such as yum update, installation of packages and so on, optionally I may allow ssh-keys getting created and copied.
Can we add a flag to remove those steps while provisioning new containers for testing on every iteration.

[CpuID]

+1, we pre-build our images with the chef preinstallation logic etc via a Dockerfile, and want to use the image config param instead of dockerfile, not together.