add set up node step for playwright

Author: davidstanke

.github/workflows/preview.yml

@@ -96,6 +96,10 @@ jobs:
         uses: actions/checkout@v4
         with:
           submodules: recursive
+      - name: Set up node. # establish build cache
+        uses: actions/setup-node@v6
+        with:
+          node-version: 24
       - name: Set up playwright
         working-directory: test/playwright
         run: npm ci && npx playwright install --with-deps