fix: add spdx header

[skip ci]

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

Author: vitormattos

playwright/e2e/sign-email-token-unauthenticated.spec.ts

@@ -1,3 +1,8 @@
+/**
+ * SPDX-FileCopyrightText: 2026 LibreCode coop and contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
 import { test, expect } from '@playwright/test';
 import { login } from '../support/nc-login'
 import { configureOpenSsl, setAppConfig } from '../support/nc-provisioning'