core: import.syzoj: del tmp file

packages/hydrooj/package.json

@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.15.28",
+    "version": "2.15.29",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",

packages/hydrooj/src/handler/import.syzoj.ts

@@ -102,6 +102,7 @@ class ProblemImportSYZOJHandler extends Handler {
         const r = download(`${url}testdata/download`);
         const file = path.resolve(os.tmpdir(), 'hydro', `import_${domainId}_${docId}.zip`);
         const w = fs.createWriteStream(file);
+        try {
             await new Promise((resolve, reject) => {
                 w.on('finish', resolve);
                 w.on('error', reject);
@@ -122,6 +123,9 @@ class ProblemImportSYZOJHandler extends Handler {
                     type: p.type === 'traditional' ? 'default' : p.type,
                 },
             });
+        } finally {
+            fs.unlinkSync(file);
+        }
         return docId;
     }