Fix Dockerfile compatibility

backend/public/index.php

@@ -1,20 +0,0 @@
-<?php
-
-use Illuminate\Foundation\Application;
-use Illuminate\Http\Request;
-
-define('LARAVEL_START', microtime(true));
-
-// Determine if the application is in maintenance mode...
-if (file_exists($maintenance = __DIR__.'/../storage/framework/maintenance.php')) {
-    require $maintenance;
-}
-
-// Register the Composer autoloader...
-require __DIR__.'/../vendor/autoload.php';
-
-// Bootstrap Laravel and handle the request...
-/** @var Application $app */
-$app = require_once __DIR__.'/../bootstrap/app.php';
-
-$app->handleRequest(Request::capture());