Fix PHP_CLI_SERVER_WORKERS inside laravel/sail (#56923)

PHP_CLI_SERVER_WORKERS environment variable did not work correctly
in laravel sail due to phpServerWorkers being set to false instead
of the set number

Author: akyrey

src/Illuminate/Foundation/Console/ServeCommand.php

@@ -101,7 +101,13 @@ protected function initialize(InputInterface $input, OutputInterface $output)
                 return false;
             }
 
-            return $workers > 1 && ! $this->option('no-reload') ? false : $workers;
+            if ($workers > 1 &&
+                ! $this->option('no-reload') &&
+                ! (int) env('LARAVEL_SAIL', 0)) {
+                return false;
+            }
+
+            return $workers;
         });
 
         parent::initialize($input, $output);