fix(di): Do not use integer node for port

When using environment variable for port in configuration, symfony command `bin/console debug:config swoole` was producing errors. Fixed deprecation warning regarding TreeBuilder.

src/Bridge/Symfony/Bundle/DependencyInjection/Configuration.php

@@ -10,10 +10,12 @@
 
 final class Configuration implements ConfigurationInterface
 {
-    private $builder;
-
     public const DEFAULT_PUBLIC_DIR = '%kernel.project_dir%/public';
 
+    private const CONFIG_NAME = 'swoole';
+
+    private $builder;
+
     public function __construct(TreeBuilder $builder)
     {
         $this->builder = $builder;
@@ -27,7 +29,9 @@ public function __construct(TreeBuilder $builder)
      */
     public function getConfigTreeBuilder(): TreeBuilder
     {
-        $rootNode = $this->builder->root('swoole');
+        $rootNode = \method_exists($this->builder, 'getRootNode') ?
+            $this->builder->getRootNode() :
+            $this->builder->root(self::CONFIG_NAME);
 
         $rootNode
             ->children()
@@ -38,9 +42,8 @@ public function getConfigTreeBuilder(): TreeBuilder
                             ->cannotBeEmpty()
                             ->defaultValue('127.0.0.1')
                         ->end()
-                        ->integerNode('port')
-                            ->min(0)
-                            ->max(65535)
+                        ->scalarNode('port')
+                            ->cannotBeEmpty()
                             ->defaultValue(9501)
                         ->end()
                         ->arrayNode('trusted_hosts')
@@ -153,6 +156,6 @@ public function getConfigTreeBuilder(): TreeBuilder
 
     public static function fromTreeBuilder(): self
     {
-        return new self(new TreeBuilder());
+        return new self(new TreeBuilder(self::CONFIG_NAME));
     }
 }