message: [docker] set RA and RIO for Backbone interface
  The docker by default set up RIO and RA for the eth0 interface. It can
  be change only during docker build time.  This commit's changes allow
  to setup RA and RIO based on backbone interface.
diff: @@ -88,6 +88,7 @@ NAT64_PREFIX=${NAT64_PREFIX/\//\\\/}
  sed -i "s/^prefix.*$/prefix $NAT64_PREFIX/" /etc/tayga.conf
  sed -i "s/dns64.*$/dns64 $NAT64_PREFIX {};/" /etc/bind/named.conf.options
  +sed -i "s/$INFRA_IF_NAME/$BACKBONE_INTERFACE/" /etc/sysctl.d/60-otbr-accept-ra.conf
  echo "OTBR_AGENT_OPTS=\"-I $TUN_INTERFACE_NAME -B $BACKBONE_INTERFACE -d7 $RADIO_URL\"" >/etc/default/otbr-agent
  echo "OTBR_WEB_OPTS=\"-I $TUN_INTERFACE_NAME -d7 -p 80\"" >/etc/default/otbr-web
  