feat: update Dockerfile and AppServiceProvider for PHP 7.2 compatibility and improved error handling

app/Providers/AppServiceProvider.php

@@ -40,6 +40,10 @@ class AppServiceProvider extends ServiceProvider {
 	 */
 	public function register()
 	{
+		// Laravel's HandleExceptions sets error_reporting(-1) which causes PECL mcrypt
+		// deprecation notices to become ErrorExceptions. Override it here to suppress E_DEPRECATED.
+		error_reporting(E_ALL & ~E_DEPRECATED & ~E_STRICT);
+
 		$this->app->bind(
 			'Illuminate\Contracts\Auth\Registrar',
 			'App\Services\Registrar'