core: pm2 cluster management

packages/vjudge/src/model.ts

@@ -91,7 +91,7 @@ class Service {
 
 async function loadAccounts() {
     // Only start a single daemon
-    if (!global.Hydro.isFirstWorker) return;
+    if (process.env.NODE_APP_INSTANCE !== '0') return;
     const accounts = await coll.find().toArray();
     for (const account of accounts) {
         if (!providers[account.type]) continue;