Include onion domain in irc bouncer config

src/freedombone-app-irc

                IRC_PORT
                IRC_BOUNCER_PORT
                IRC_PASSWORD
+               IRC_ONION_HOSTNAME
                IRC_OPERATOR_PASSWORD
                DEFAULT_DOMAIN_NAME
                INSTALLED_WITHIN_DOCKER
     echo '        LoadModule = simple_away' >> /home/znc/.znc/config/znc.conf
     echo '' >> /home/znc/.znc/config/znc.conf
     echo "        Server     = ${DEFAULT_DOMAIN_NAME} +${IRC_PORT}" >> /home/znc/.znc/config/znc.conf
+    echo "        Server     = ${IRC_ONION_HOSTNAME} +${IRC_PORT}" >> /home/znc/.znc/config/znc.conf
     echo '' >> /home/znc/.znc/config/znc.conf
     echo "        <Chan ${PROJECT_NAME}>" >> /home/znc/.znc/config/znc.conf
     echo '        </Chan>' >> /home/znc/.znc/config/znc.conf