Add packager v4 so we can already build cache

Author: Ives van Hoorne

src/app/store/entities/sandboxes/bundler/index.js

@@ -10,6 +10,7 @@ import logError from '../../../../utils/error';
 const debug = _debug('cs:app:packager');
 
 export const PACKAGER_URL = 'https://cdn.jsdelivr.net/webpack/v3';
+export const NEW_PACKAGER_URL = 'https://cdn.jsdelivr.net/webpack/v4';
 
 const RETRY_COUNT = 10;
 
@@ -20,6 +21,13 @@ const RETRY_COUNT = 10;
  * @param {string} query The dependencies to call
  */
 async function requestPackager(query: string) {
+  // Also call new packager to build cache
+  try {
+    callApi(`${NEW_PACKAGER_URL}/${query}/manifest.json`);
+  } catch (e) {
+    console.error(e);
+  }
+
   let retries = 0;
 
   while (true) {