fix: check if USE_AUTH is "yes" because boolean values do not work in k8s

Author: DominikFischli

src/database.php

@@ -18,7 +18,7 @@
 
 include './config.php';
 
-if ($config['USE_BASIC_AUTH']) {
+if ($config['USE_BASIC_AUTH'] === "yes") {
   include './auth.php';
 }