fix(gitlab): check the private key before using it for git commands

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

bootstrap/helpers/gitlab.php

@@ -1,6 +1,7 @@
 <?php
 
 use App\Models\GitlabApp;
+use App\Models\PrivateKey;
 use Illuminate\Support\Facades\Cache;
 use Illuminate\Support\Facades\Http;
 
@@ -83,6 +84,13 @@ function gitlabApi(GitlabApp $source, string $endpoint, string $method = 'get',
     ];
 }
 
+function gitlabAppPrivateKey(GitlabApp $source): ?PrivateKey
+{
+    $privateKey = $source->privateKey;
+
+    return $privateKey?->team_id === $source->team_id ? $privateKey : null;
+}
+
 function generateGitlabCloneToken(GitlabApp $source): string
 {
     refreshGitlabToken($source);