push-images-to-glance.py creates wrong datastructure for a non already existing image

data:
  values.yaml: |
    os_images:
      ubuntu-jammy-plain-kubeadm-1-26-9: 90b6d702-a64f-491a-a853-dcffc3143277
      ubuntu-jammy-plain-rke2-1-26-9:
        openstack_glance_uuid: 9b812ba9-d4d2-4d1a-b7a3-c13949d65f42

/cc @mihai.zaharia