Allow streaming server to take bindhost from HOST env

streaming/index.js

@@ -467,7 +467,7 @@ const startWorker = (workerId) => {
     });
   }, 30000);
 
-  server.listen(process.env.PORT || 4000, () => {
+  server.listen(process.env.PORT || 4000, process.env.HOST || '127.0.0.1', () => {
     log.info(`Worker ${workerId} now listening on ${server.address().address}:${server.address().port}`);
   });