Created middleware which closes DB connection after every request

config/autoload/entity-manager.global.php

@@ -1,7 +1,7 @@
 <?php
 declare(strict_types=1);
 
-use Shlinkio\Shlink\Common;
+use function Shlinkio\Shlink\Common\env;
 
 return [
 
@@ -10,9 +10,9 @@ return [
             'proxies_dir' => 'data/proxies',
         ],
         'connection' => [
-            'user' => Common\env('DB_USER'),
-            'password' => Common\env('DB_PASSWORD'),
-            'dbname' => Common\env('DB_NAME', 'shlink'),
+            'user' => env('DB_USER'),
+            'password' => env('DB_PASSWORD'),
+            'dbname' => env('DB_NAME', 'shlink'),
             'charset' => 'utf8',
         ],
     ],

config/autoload/middleware-pipeline.global.php

@@ -10,10 +10,18 @@ return [
 
     'middleware_pipeline' => [
         'pre-routing' => [
-            'middleware' => [
-                ErrorHandler::class,
-                Expressive\Helper\ContentLengthMiddleware::class,
-            ],
+            'middleware' => (function () {
+                $middleware = [
+                    ErrorHandler::class,
+                    Expressive\Helper\ContentLengthMiddleware::class,
+                ];
+
+                if (Common\Exec\ExecutionContext::currentContextIsSwoole()) {
+                    $middleware[] = Common\Middleware\CloseDbConnectionMiddleware::class;
+                }
+
+                return $middleware;
+            })(),
             'priority' => 12,
         ],
         'pre-routing-rest' => [