fix: style code with phpstan

Author: tanhongit

src/Commands/ChangeOwnerConfigJson.php

@@ -31,20 +31,19 @@ public function handle(): void
     {
         if (PHP_OS_FAMILY !== 'Linux') {
             $this->error('This command only works on Linux');
-
             return;
         }
 
-        $user = $this->argument('user') ?? '';
-        $group = $this->argument('group') ?? $user;
+        $user = (string) ($this->argument('user') ?? '');
+        $group = (string) ($this->argument('group') ?? $user);
 
         if (empty($user) || empty($group)) {
-            $group = $user = exec('ps aux | egrep "(apache|httpd|nginx)" | grep -v "root" | head -n1 | cut -d\  -f1');
+            $group = $user = (string) exec('ps aux | egrep "(apache|httpd|nginx)" | grep -v "root" | head -n1 | cut -d\  -f1');
         }
 
         $jsonsPath = config('telegram-git-notifier.data_file.storage_folder');
         if (is_string($jsonsPath) && file_exists($jsonsPath)) {
-            shell_exec("chown -R $user:$group $jsonsPath");
+            shell_exec("chown -R " . escapeshellarg($user) . ":" . escapeshellarg($group) . " " . escapeshellarg($jsonsPath));
         } else {
             $this->error('The path to the jsons folder is not valid');
         }