[openstack-ansible] Designate: rndc config file not generated

Hello, I'm deploying Designate on OpenStack Wallaby/Ubuntu 20.04 with DNS servers located outside the OpenStack platform. After running 'os-designate-install.yml' playbook, 'bind9-utils' package is correctly installed but I can't find rndc config file anywhere inside the lxc container. This prevents rndc from running well and communicating with the DNS servers. Any idea ? Regards, Jean-Francois