fix(Setup): Ensure instanceid is generated during installation

Signed-off-by: provokateurin <kate@provokateurin.de>

Author: provokateurin

lib/private/Setup.php

@@ -378,6 +378,9 @@ public function install(array $options, ?IOutput $output = null): array {
 
 		$this->config->setValues($newConfigValues);
 
+		// Ensure instanceid is generated during the installation.
+		\OC_Util::getInstanceId();
+
 		$this->outputDebug($output, 'Configuring database');
 		$dbSetup->initialize($options);
 		try {