Resolve WEBSOCKETS_URI config problem

- Value was not overtaken from .env.

webapp/config/index.js

@@ -18,6 +18,7 @@ const environment = {
 const server = {
   GRAPHQL_URI: process.env.GRAPHQL_URI || 'http://localhost:4000',
   BACKEND_TOKEN: process.env.BACKEND_TOKEN || 'NULL',
+  WEBSOCKETS_URI: process.env.WEBSOCKETS_URI || 'ws://localhost:4000/graphql',
 }
 
 const sentry = {

webapp/plugins/apollo-config.js

@@ -11,7 +11,7 @@ export default ({ req, nuxtState }) => {
   const backendUrl = env.GRAPHQL_URI || 'http://localhost:4000'
 
   return {
-    wsEndpoint: env.WEBSOCKETS_URI || 'ws://localhost:4000/graphql',
+    wsEndpoint: env.WEBSOCKETS_URI,
     httpEndpoint: process.server ? backendUrl : '/api',
     httpLinkOptions: {
       credentials: 'same-origin',