ci: add playwright

Author: KilianTrunk

.github/workflows/test-runner.yml

@@ -47,6 +47,17 @@ jobs:
         with:
           ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
 
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install and update Playwright
+        run: |
+          npm install playwright@latest
+          npx playwright install
+
       - name: Validate composer.json and composer.lock
         run: composer validate --strict