Create .env file with the following content:
VAGRANT_EXPERIMENTAL="cloud_init,disks"
Modify cloud-init-test.yml file and then execute vagrant up.
Test your VM with vagrant ssh to see the results of your cloud-init execution.
For more details please check https://www.grzegorowski.com/how-to-test-cloud-init-locally-with-vagrant
author: Jan Grzegorowski