Set docker environment variables from minikube

[mvgijssel]

Setting the docker environment variables from minikube using function

eval $(minikube docker-env)

allows the docker cli tool to communicate with the docker daemon inside of minikube.

The output of the function looks like

export DOCKER_TLS_VERIFY="1"
export DOCKER_HOST="tcp://192.168.64.1:2376"
export DOCKER_CERT_PATH="~/.minikube/certs"
# Run this command to configure your shell:
# eval $(minikube docker-env)

Hardcoding the docker environment variables is problematic, due to the DOCKER_HOST ip changing as hardcoded ip's are not supported (yet) kubernetes/minikube#951.

The minikube start command does not set the docker env as well, so created a wrapper method mkube which writes and sources the current docker environment to .dockerenv.