fix: validate engine name in migration to prevent installation failures

During app installation, the migration Version13000Date20251031165700
was attempting to generate a CA identifier with an invalid or 'none'
engine name, causing InvalidArgumentException.

This fix adds validation to ensure only valid engine names ('openssl'
or 'cfssl') are used when generating the CA identifier. Invalid values
are now safely ignored.

Fixes installation error: 'Database error when running migration
13000Date20251031165700 for app libresign - Invalid engine name: none'

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

lib/Migration/Version13000Date20251031165700.php

@@ -138,7 +138,8 @@ private function migrateToNewestConfigFormat(): void {
 		$originalCaId = $this->appConfig->getValueString(Application::APP_ID, 'ca_id');
 		if (empty($originalCaId)) {
 			$engineName = $this->appConfig->getValueString(Application::APP_ID, 'certificate_engine');
-			if ($engineName) {
+			$validEngines = ['openssl', 'cfssl'];
+			if (!empty($engineName) && in_array($engineName, $validEngines, true)) {
 				$originalCaId = $this->caIdentifierService->generateCaId($engineName);
 			}
 		}