CI/kubevirt: Configure ignition provisioning

Flatcar does not support cloud-init

tests/cloud_playbooks/roles/packet-ci/templates/vm.yml.j2

@@ -55,13 +55,5 @@ spec:
       containerDisk:
         image: quay.io/kubespray/vm-{{ cloud_image }}
     - name: cloudinitvolume
-      cloudInitConfigDrive:
-        userData: |
-          #cloud-config
-           users:
-             - name: {{ lookup('env', 'ANSIBLE_REMOTE_USER') }}
-               sudo: ALL=(ALL) NOPASSWD:ALL
-               shell: /bin/bash
-               lock_passwd: False
-               ssh_authorized_keys:
-                 - {{ ssh_key.public_key }}
+      cloudInit{{ 'ConfigDrive' if cloud_image.startswith('flatcar') else 'NoCloud' }}:
+        userDataBase64: '{{ ((ignition_config | to_json) if cloud_image.startswith('flatcar') else cloudinit_config) | b64encode }}'