Add Node.js setup step to static.yml workflow

.github/workflows/static.yml

@@ -31,6 +31,9 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
       - name: Build static site
         run: yarn build
       - name: Setup Pages