judge: hydrojudge cache prune

packages/hydrojudge/package.json

@@ -1,7 +1,7 @@
 {
     "name": "@hydrooj/hydrojudge",
     "bin": "bin/hydrojudge.js",
-    "version": "2.12.6",
+    "version": "2.12.7",
     "main": "package.json",
     "author": "undefined <i@undefined.moe>",
     "repository": "https://github.com/hydro-dev/Hydro.git",

packages/hydrojudge/src/cache.ts

@@ -1,3 +1,5 @@
+import './utils';
+
 import path from 'path';
 import cac from 'cac';
 import fs from 'fs-extra';
@@ -5,7 +7,6 @@ import { getConfig } from './config';
 import { Logger } from './log';
 
 const argv = cac().parse();
-
 const logger = new Logger('cache');
 
 export = function main() {