Could not find init script for 'supervisord'

[Fr33maan]

On debian 8 in a docker container:
puppet 4.8.1
module version 0.6.1

class supervisor_daemon {
    supervisord::program { 'sshd':
      command             => '/usr/sbin/sshd',
      priority            => '10',
    }

    supervisord::program { 'mariadb':
      command             => '/usr/sbin/mysqld',
      priority            => '20',
    }

    supervisord::program { 'nullmailer':
      command             => '/usr/sbin/nullmailer-send -s',
      priority            => '110',
    }
}

Leads into following error:
Error: Could not find init script for 'supervisord'
Error: /Stage[main]/Supervisord::Service/Service[supervisord]/ensure: change from stopped to running failed: Could not find init script for 'supervisord'