move to tpl for config.js

web/rootfs/etc/cont-init.d/10-config

@@ -62,13 +62,7 @@ if [[ ! -f /config/nginx/site-confs/default ]]; then
 fi
 
 if [[ ! -f /config/config.js ]]; then
-    cp /defaults/config.js /config/config.js
-    sed -i \
-        -e "s#jitsi-meet.example.com#$XMPP_DOMAIN#g" \
-        -e "s#bosh:.*#bosh: '/http-bind',#" \
-        -e "s#muc:.*#muc: '${XMPP_MUC_DOMAIN}',#" \
-        -e "s#// focusUserJid:.*#focusUserJid: '${JICOFO_AUTH_USER}@${XMPP_AUTH_DOMAIN}',#" \
-        /config/config.js
+    tpl /defaults/config.js > /config/config.js
 
     if [[ $ENABLE_RECORDING -eq 1 || x$ENABLE_RECORDING == xtrue ]]; then
         sed -i \