cloud-init: no ssh keys created for additional users

[mudler]

This seems to create the 'vagrant' user, but not the ssh keys (note, root had the keys correctly added):

#cloud-config

# Add additional users or set the password/ssh keys for root
users:
- name: "root"
  passwd: "ros"
  ssh_authorized_keys:
  - https://raw.githubusercontent.com/hashicorp/vagrant/main/keys/vagrant.pub
- name: "vagrant"
  passwd: "vagrant"
  shell: "/bin/bash"
  homedir: "/run/vagrant"
  ssh_authorized_keys:
  - https://raw.githubusercontent.com/hashicorp/vagrant/main/keys/vagrant.pub

Originally posted by @mudler in #13 (comment)

[mudler]

Opened: #99

[mudler]

Needs a cOS bump, blocked by #16