test(integration): resolve TSA URL placeholder from env

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

Author: vitormattos

tests/integration/features/bootstrap/FeatureContext.php

@@ -49,6 +49,7 @@ protected function beforeRequest(string $fullUrl, array $options): array {
 	protected function parseText(string $text): string {
 		$fields = $this->fields;
 		$fields['BASE_URL'] = $this->baseUrl . '/index.php';
+		$fields['TSA_URL'] = getenv('LIBRESIGN_TSA_URL') ?: 'https://freetsa.org/tsr';
 		foreach ($fields as $key => $value) {
 			$patterns[] = '/<' . $key . '>/';
 			$replacements[] = $value;