update port checking on prod

server/static.js

@@ -0,0 +1,9 @@
+const path = require('path')
+
+const setup = ({ server }) => {
+  server.get('/robots.txt', (req, res) => {
+    res.sendFile(path.join(__dirname, '../static', 'robots.txt'));
+  });
+}
+
+module.exports = setup