Pass through IGNITION_LOCAL_SITES_PATH environment variable when serving (#46857)

Enables correct link generation for opening files from the error page when running inside docker.

Author: NiclasvanEyk

src/Illuminate/Foundation/Console/ServeCommand.php

@@ -57,6 +57,7 @@ class ServeCommand extends Command
      */
     public static $passthroughVariables = [
         'APP_ENV',
+        'IGNITION_LOCAL_SITES_PATH',
         'LARAVEL_SAIL',
         'PATH',
         'PHP_CLI_SERVER_WORKERS',