copy authorized keys from the host
use packer for that, see libvirt README
https://hub.docker.com/_/docker/ https://github.com/llamashoes/dind-kubernetes (uses older dind) http://iocanel.blogspot.ru/2015/09/jenkins-setups-for-kubernetes-and.html https://github.com/docker/docker/blob/master/hack/dind
Actually not the correct way to do it.
cat ~/.ssh/authorized_keys | vagrant ssh – ‘sudo mkdir root.ssh && sudo chmod 700 root.ssh && sudo tee root.ssh/authorized_keys >>/home/vagrant/.ssh/authorized_keys’