Add proxy support for env configs on curl request

Author: NASSAR Mohammed (DIGIT-EXT)

src/Configuration/DotEnvConfiguration.php

@@ -41,6 +41,10 @@ public function __construct($path = '.')
         $this->curlOptSslVerifyPeer = $this->env('CURLOPT_SSL_VERIFYPEER', false);
         $this->curlOptUserAgent = $this->env('CURLOPT_USERAGENT', $this->getDefaultUserAgentString());
         $this->curlOptVerbose = $this->env('CURLOPT_VERBOSE', false);
+        $this->proxyServer = $this->env('PROXY_SERVER');
+        $this->proxyPort = $this->env('PROXY_PORT');
+        $this->proxyUser = $this->env('PROXY_USER');
+        $this->proxyPassword = $this->env('PROXY_PASSWORD');
     }
 
     /**