refactor: add YARN_CACHE_FOLDER to env

lib/workers/branch/lock-files.js

@@ -302,7 +302,10 @@ async function getUpdatedLockFiles(config) {
   const env =
     config.global && config.global.exposeEnv
       ? process.env
-      : { PATH: process.env.PATH };
+      : {
+          PATH: process.env.PATH,
+          YARN_CACHE_FOLDER: process.env.YARN_CACHE_FOLDER,
+        };
   env.NODE_ENV = 'dev';
 
   for (const lockFileDir of dirs.packageLockFileDirs) {