Generate instanceId and include in hash for cache busting

packages/node_modules/@node-red/runtime/lib/index.js

@@ -27,6 +27,7 @@ var express = require("express");
 var path = require('path');
 var fs = require("fs");
 var os = require("os");
+const crypto = require("crypto")
 
 const {log,i18n,events,exec,util,hooks} = require("@node-red/util");
 
@@ -51,7 +52,7 @@ var adminApi = {
 var nodeApp;
 var adminApp;
 var server;
-
+let userSettings;
 
 /**
  * Initialise the runtime module.
@@ -61,8 +62,9 @@ var server;
  *                              better abstracted.
  * @memberof @node-red/runtime
  */
-function init(userSettings,httpServer,_adminApi) {
+function init(_userSettings,httpServer,_adminApi) {
     server = httpServer;
+    userSettings = _userSettings
 
     if (server && server.on) {
         // Add a listener to the upgrade event so that we can properly timeout connection
@@ -134,7 +136,10 @@ function start() {
         .then(function() { return settings.load(storage)})
         .then(function() { return library.init(runtime)})
         .then(function() {
-
+            if (settings.get('instanceId') === undefined) {
+                settings.set('instanceId', crypto.randomBytes(8).toString('hex'))
+            }
+            userSettings.instanceId = settings.get('instanceId') || ''
             if (log.metric()) {
                 runtimeMetricInterval = setInterval(function() {
                     reportMetrics();