chore: Allow Self Hosted Instances to use Support Inbox within Dashboard for Agents (#3907)

app/views/layouts/vueapp.html.erb

@@ -67,7 +67,7 @@
     <script>
       window.chatwootSettings = { hideMessageBubble: true, position: 'left' };
       (function(d,t) {
-        var BASE_URL="https://app.chatwoot.com";
+        var BASE_URL='<%= ENV.fetch('FRONTEND_URL', 'https://app.chatwoot.com') %>';
         var g=d.createElement(t),s=d.getElementsByTagName(t)[0];
         g.src=BASE_URL+"/packs/js/sdk.js"; g.defer=true; g.async=true;
         s.parentNode.insertBefore(g,s);