pre-install yq in the docker container. Right now carvel tool is installed in the docker container. Hence, when merlin script does not find yq installed it starts installing yq as part of the setup process. Adding yq install in the docker file will have docker container with yq pre-installed in which case Merlin script will detect that it is already installed and will not attempt to install it again during setup process. This will super useful (and critical) for airgapped environment. #13