ci: setup-node

Author: TobiTenno

.github/workflows/ci.yaml

@@ -73,6 +73,10 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v6
+      - name: Use Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version-file: '.nvmrc'
       - run: npm ci
       - name: Build
         run: npm run build:docs