roles/create-vms/templates/ansible_hosts.j2

[localhost]
127.0.0.1 hostname={{ ansible_fqdn }}

[services]
{% for vm in head_vm_list -%}
{{ vm.name }}
{% endfor -%}

[docker]
{% for vm in head_vm_list | selectattr('docker_path', 'defined') -%}
{{ vm.name }}
{% endfor -%}