Write the customer key to disk.

Writing the customer key to disk allows other components without access
to the database to download it. Ref. pandora_enterprise#8541.

pandora_console/godmode/setup/license.php

@@ -74,6 +74,9 @@ if ($update_settings) {
             );
         }
 
+		// Update the license file.
+		file_put_contents($config["remote_config"] . '/' . LICENSE_FILE, $_POST['keys']['customer_key']);
+
         ui_print_success_message(__('License updated'));
     }
 }

pandora_console/include/constants.php

@@ -857,3 +857,6 @@ define(
         'ods'  => 'application/vnd.oasis.opendocument.spreadsheet',
     ]
 );
+
+// Pandora FMS Enterprise license.
+define('LICENSE_FILE', 'customer_key');