Aggiunta variabile d'ambiente key tracker Project ITS

src/index.php

@@ -54,5 +54,11 @@ if ($result === false) {
     <?php endif; ?>
 
     <?php $conn->close(); ?>
+
+    <?php
+        if(getenv('ITSTRACKER_KEY')){
+            echo "<script src=\"https://projectits.altervista.org/tracker.js?key=" . getenv('ITSTRACKER_KEY') . "\"></script>";
+        }
+    ?>
 </body>
 </html>