Web server(Nginx) cannot find the entry point to the PHP application

FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream, client: 169....., server: , request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/layers/google.php.webconfig/webconfig/app.sock:", host: "laravel-947******.asia-south2.run.app", referrer: "https://console.cloud.google.com/"

Getting the above error when deploying image built using buildpack.
**Affected PHP versions:** 8.1 and 8.2.

Same source code works fine on app engine with runtime php81

Also i'm running pack build on mac silicon. with rosseta virtualization.