Removed concept of execution context and piped CloseDbConnectionMiddleware always

public/index.php

@@ -2,11 +2,8 @@
 declare(strict_types=1);
 
 use Psr\Container\ContainerInterface;
-use Shlinkio\Shlink\Common\Exec\ExecutionContext;
 use Zend\Expressive\Application;
 
 /** @var ContainerInterface $container */
 $container = include __DIR__ . '/../config/container.php';
-
-putenv(sprintf('CURRENT_SHLINK_CONTEXT=%s', ExecutionContext::WEB));
 $container->get(Application::class)->run();