core: pm2 cluster management

packages/hydrooj/test/db.ts

@@ -1,4 +1,3 @@
-import cluster from 'cluster';
 import 'hydrooj/src/loader';
 import * as bus from 'hydrooj/src/service/bus';
 
@@ -23,5 +22,4 @@ export async function dispose() {
     const db = require('hydrooj/src/service/db');
     await db.stop();
     bus.emit('app/exit');
-    for (const key in cluster.workers) cluster.workers[key].destroy('SIGINT');
 }