fix: env ports (#273)

siren.js

@@ -1,11 +1,12 @@
 const express = require('express')
 const next = require('next')
 const EventSource = require('eventsource')
+require('dotenv').config()
+
 const dev = process.env.NODE_ENV !== 'production'
 const app = next({ dev })
 const handle = app.getRequestHandler()
 const PORT = process.env.PORT || 3000
-require('dotenv').config()
 
 const backendUrl = process.env.BACKEND_URL