Include Server.Auth.Host in docker server.ini

The older client seems to want this for reasons that I don't fully care
to investigate at the moment. It should be grabbing it from the
GateKeeper, shouldn't it?

bin/docker-entrypoint.sh

@@ -145,6 +145,7 @@ Server.Status "${SHARD_STATUS_URL:-http://${DS_HOST:-127.0.0.1}:8080/welcome}"
 
 # Shard front-end server address.
 Server.Gate.Host "${DS_HOST:-127.0.0.1}"
+Server.Auth.Host "${DS_HOST:-127.0.0.1}"
 Server.Port ${SHARD_PORT:-14617}
 
 # Shard name - NOTE: this is currently not visible anywhere.