add node_modules caching for when package-lock hasn't changed

.github/workflows/ci.yml

@@ -22,7 +22,15 @@ jobs:
         with:
           node-version-file: "package.json"
 
+      - name: Restore dependencies
+        id: restore-dependencies
+        uses: actions/cache@v4
+        with:
+          path: node_modules
+          key: js-depend-${{ runner.os }}-${{ hashFiles('**/package-lock.json') }}
+
       - name: Install dependencies
+        if: steps.restore-dependencies.outputs.cache-hit != 'true'
         run: npm ci
 
       - name: Build third-party libraries