fix for env vars

Author: joanfabregat

.github/workflows/phpunit.yml

@@ -20,6 +20,7 @@ jobs:
         with:
           php-version: 8.3
           tools: composer
+          ini-values: variables_order=EGPCS
 
       # Install dependencies
       - name: Install dependencies

src/Client.php

@@ -48,7 +48,7 @@ public function __construct(
         ?string $apiKey = null,
         ?ClientInterface $client = null,
     ) {
-        $apiKey = $apiKey ?? getenv('DOCUMENT_CLOUD_API_KEY') ?? null;
+        $apiKey = $apiKey ?? $_ENV['DOCUMENT_CLOUD_API_KEY'] ?? null;
         if (!$apiKey) {
             throw new MissingApiKeyException();
         }