[infra] Use cpu option only in CI (#46588)

Author: Janpot

docs/nextConfigDocsInfra.js

@@ -75,7 +75,7 @@ function withDocsInfra(nextConfig) {
     experimental: {
       scrollRestoration: true,
       workerThreads: false,
-      cpus: 3,
+      ...(process.env.CI ? { cpus: 3 } : {}),
       ...nextConfig.experimental,
     },
     eslint: {