chore(workflow): add npm ci step to install dependencies in GitHub Actions

Author: raffaele-filiberti

.github/workflows/static.yml

@@ -31,6 +31,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+      - name: Install dependencies
+        run: npm ci
       - name: Build
         run: npm run demo:build
       - name: Setup Pages