Vagrant uses the "insecure private key" to establish the first SSH
connection to a new VM based on a clean public box. In theory, the
`vagrant package` command should do that automatically. This process
is still using custom code instead of `vagrant package`, hence this
script.
This public key can be generated on any Vagrant install using:
ssh-keygen -y -f ~/.vagrant.d/insecure_private_key
https://www.vagrantup.com/docs/vagrantfile/ssh_settings#config-ssh-private_key_path
fdroid-bootstrap-buildserver#12
!1012!1099
