Cloud-Init support

Hello,

Are there any plans to bring cloud-init support to your Vagrant boxes?
- https://cloud-init.io/
- https://developer.hashicorp.com/vagrant/docs/cloud-init/configuration 

I think it is a pity that this very useful feature is missing from your boxes :(

ℹ️ In my case I use your boxes with `libvirt`. :)
 
Thank you!