ci(playwright): add merge config

This allows to merge reports if one report is from a self-hosted runner
and another is from a github runner.

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

Author: susnux

.github/workflows/playwright.yml

@@ -92,7 +92,7 @@ jobs:
         merge-multiple: true
 
     - name: Merge into HTML Report
-      run: npx playwright merge-reports --reporter html ./all-blob-reports
+      run: npx playwright merge-reports --config tests/playwright/merge.config.ts ./all-blob-reports
 
     - name: Upload HTML report
       uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0

tests/playwright/merge.config.ts

@@ -0,0 +1,11 @@
+/*!
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+// Needed to merge multiple Playwright reports
+// when they are ran on self-hosted and github runners (different test directories are used)
+export default {
+	testDir: 'tests/playwright/e2e',
+	reporter: [['html', { open: 'never' }]],
+}