chore(tools): run snap-test in parallel on local machines (#257)

CI env still fails, see https://app.graphite.dev/github/pr/voidzero-dev/vite-plus/251/chore(cli)-restore-to-run-snap-test-parallel  
  
run 10 times work:  
`seq 10 | xargs -n 1 sh -c 'pnpm bootstrap-cli && pnpm test && git status'`

Author: fengmk2

packages/tools/src/snap-test.ts

@@ -36,19 +36,26 @@ process.on('exit', () => fs.rmSync(tempTmpDir, { recursive: true, force: true })
 const casesDir = path.resolve('snap-tests');
 
 const filter = process.argv[2] ?? ''; // Optional filter to run specific test cases
+const isCI = process.env.CI === 'true';
 
-// const tasks: Promise<void>[] = [];
+const tasks: Promise<void>[] = [];
 for (const caseName of fs.readdirSync(casesDir)) {
   if (caseName.startsWith('.')) continue; // Skip hidden files like .DS_Store
   if (caseName.includes(filter)) {
-    // FIXME: parallel run will cause [Error: Broken pipe (os error 32)] { code: 'GenericFailure' }
-    // tasks.push(runTestCase(caseName));
-    await runTestCase(caseName);
+    if (isCI) {
+      // FIXME: parallel run will cause panicked: Access tokio runtime failed in spawn, maybe related to napi-3.3.0/src/tokio_runtime.rs:113:6
+      // see https://app.graphite.dev/github/pr/voidzero-dev/vite-plus/251/chore(cli)-restore-to-run-snap-test-parallel
+      await runTestCase(caseName);
+    } else {
+      // let snap-test run faster on local machine
+      tasks.push(runTestCase(caseName));
+    }
   }
 }
 
-// await Promise.all(tasks);
-
+if (tasks.length > 0) {
+  await Promise.all(tasks);
+}
 interface Steps {
   ignoredPlatforms?: string[];
   env: Record<string, string>;