Guest system version: Windows 10 professional
Virtualbox version: 6.1.6 r137129
Vagrant version: 2.2.7
Boot2docker.iso version: v19.03.5

I use boot2docker as the virtual system of vagrant. I need to set config.ssh.insert_key = true to use Rsync's shared folder mode.
However, due to the directory permission problem of /home/docker, the docker user cannot create authorized_keys in this folder, so I hope you can help to set the user of /home/docker as docker user

chown -R docker:docker /home/docker