ci: use cache

Author: Cryolitia

.github/workflows/build.yaml

@@ -37,8 +37,10 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: current
+          cache: npm
       - name: Install node packages
         run: npm ci
+      - uses: Swatinem/[email protected]
       - name: Install mdBook
         uses: baptiste0928/cargo-install@v2
         with: