fix docker setup

apps/website/next.config.mjs

@@ -1,9 +1,14 @@
 /** @type {import('next').NextConfig} */
 
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
 const nextConfig = {
   reactStrictMode: true,
-  // Fix for Next.js 13+ Turbopack in monorepos to correctly identify the workspace root
-  outputFileTracingRoot: '/Users/marcmintel/Projects/gridpilot',
+  // Fix for monorepos: point tracing to repo root (portable across machines/containers)
+  outputFileTracingRoot: path.join(__dirname, '../..'),
   images: {
     remotePatterns: [
       {