improve check install status when running in docker

nexus/Install/Install.php

@@ -49,7 +49,9 @@ class Install
         'pcntl_signal', 'pcntl_alarm', 'pcntl_async_signals'
     ];
 
-    protected string $lockFile = 'install.lock';
+    const INSTALL_LOCK_FILE = 'dont_delete_install.lock';
+
+    protected string $lockFile = self::INSTALL_LOCK_FILE;
 
     public function __construct()
     {

nexus/Nexus.php

@@ -176,6 +176,11 @@ final class Nexus
         return false;
     }
 
+    public function isFpmMode(): bool
+    {
+        return php_sapi_name() === 'fpm-fcgi';
+    }
+
     private function generateRequestId(): string
     {
         $prefix = ($_SERVER['SCRIPT_FILENAME'] ?? '') . implode('', $_SERVER['argv'] ?? []);