fix(utils): prevent race condition in parallel plugin runs

When running the same plugin for multiple projects in parallel (e.g., via
Nx targets), the timestamp-based directory naming could collide if two
processes started within the same millisecond.

This caused one process to delete the output directory while another was
still using it, leading to failures.

The fix adds process.pid and a random suffix to the directory name,
ensuring uniqueness even when multiple processes run simultaneously.

Author: beaussan

packages/utils/src/lib/create-runner-files.ts

@@ -13,8 +13,10 @@ export async function createRunnerFiles(
   pluginSlug: string,
   configJSON: string,
 ): Promise<RunnerFilesPaths> {
-  const timestamp = Date.now().toString();
-  const runnerWorkDir = path.join(pluginWorkDir(pluginSlug), timestamp);
+  // Use timestamp + process ID + random suffix to ensure uniqueness
+  // This prevents race conditions when running the same plugin for multiple projects in parallel
+  const uniqueId = `${Date.now()}-${process.pid}-${Math.random().toString(36).slice(2, 8)}`;
+  const runnerWorkDir = path.join(pluginWorkDir(pluginSlug), uniqueId);
   const runnerConfigPath = path.join(runnerWorkDir, 'plugin-config.json');
   const runnerOutputPath = path.join(runnerWorkDir, 'runner-output.json');