feat: Add audio alert for incoming messages on dashboard (#1738)

Fixes: #1345

app/javascript/packs/application.js

@@ -20,6 +20,7 @@ import App from '../dashboard/App';
 import i18n from '../dashboard/i18n';
 import createAxios from '../dashboard/helper/APIHelper';
 import commonHelpers from '../dashboard/helper/commons';
+import { getAlertAudio } from '../shared/helpers/AudioNotificationHelper';
 import router from '../dashboard/routes';
 import store from '../dashboard/store';
 import vueActionCable from '../dashboard/helper/actionCable';
@@ -70,7 +71,6 @@ window.onload = () => {
   }).$mount('#app');
   vueActionCable.init();
 };
-
 window.addEventListener('load', () => {
   verifyServiceWorkerExistence(registration =>
     registration.pushManager.getSubscription().then(subscription => {
@@ -79,4 +79,5 @@ window.addEventListener('load', () => {
       }
     })
   );
+  getAlertAudio();
 });