VM creation script

[tomjn]

• Vagrant ruby action: https://github.com/tomjn/vagrant-tart-ruby/blob/main/lib/vagrant/tart/action/create_instance.rb
• driver function: https://github.com/tomjn/vagrant-tart-ruby/blob/main/lib/vagrant/tart/driver.rb#L42
• shellscript: https://github.com/tomjn/vagrant-tart-ruby/blob/main/lib/vagrant/tart/scripts/create_vm.sh

To do this we'd need to run the tart import command and give it the vagrant box file. Currently tart doesn't have this command at the time of writing but it was added in https://github.com/cirruslabs/tart/pull/386 and should be released soon.

Previously, the plan was to copy the VM from inside the box file into Tarts VM folders with the vagrant ID and a prefix, then use tart run to start it. I've successfully cloned Tart VMs manually this way. There's also tart clone which can duplicate VMs, but this runs the risk of users manually starting box VMs and modifying them, then all subsequent VMs being broken or changed.

[tomjn]

Similar to the Hyper-V scripts, the shellscript should get called with the VM's intended ID as decided by vagrant as the parameter