infra/roles/provision/tasks/main.yml

---
- name: validate nodes providers
  fail: msg="provider '{{item.provider}}' is not supported"
  when: item.provider not in provision_supported_providers
  with_items: "{{provision_nodes}}"

- name: provision nodes
  include_tasks: "{{item.provider}}.yml"
  vars:
    node: "{{item}}"
  with_items: "{{provision_nodes}}"