add default value for jwt_secret

medusa-config.js

@@ -71,7 +71,7 @@ const modules = {
 
 /** @type {import('@medusajs/medusa').ConfigModule["projectConfig"]} */
 const projectConfig = {
-  jwt_secret: process.env.JWT_SECRET,
+  jwt_secret: process.env.JWT_SECRET || "supersecret",
   cookie_secret: process.env.COOKIE_SECRET,
   store_cors: STORE_CORS,
   database_url: DATABASE_URL,