use the already JWT SERCRET in the env

.env.example

@@ -14,5 +14,4 @@ BOT_TOKEN = "123"
 GUILD_ID = "123"
 LOCAL_CMS_PROVIDER = true
 CACHE_EXPIRE_S = 10
-JWT_SECRET_TOKEN="JWT_SECRET_TOKEN"
 

src/app/admin/user/page.tsx

@@ -0,0 +1,7 @@
+import React from 'react';
+
+const page = () => {
+  return <div>page</div>;
+};
+
+export default page;

src/lib/auth.ts

@@ -3,7 +3,7 @@ import CredentialsProvider from 'next-auth/providers/credentials';
 import { SignJWT, importJWK } from 'jose';
 
 const generateJWT = async (payload: any) => {
-  const secret = process.env.JWT_SECRET_TOKEN || 'secret';
+  const secret = process.env.JWT_SECRET || 'secret';
 
   const jwk = await importJWK({ k: secret, alg: 'HS256', kty: 'oct' });