re-add node_modules cache

This in combination with `cache: npm` for the `setup-node` would be
awesome if that works.

.github/workflows/nodejs.yml

@@ -28,7 +28,17 @@ jobs:
           node-version: ${{ matrix.node-version }}
           cache: 'npm'
 
+      - name: Use cached node_modules
+        id: cache
+        uses: actions/cache@v3
+        with:
+          path: node_modules
+          key: nodeModules-${{ hashFiles('**/package-lock.json') }}-${{ matrix.node-version }}
+          restore-keys: |
+            nodeModules-
+
       - name: Install dependencies
+        if: steps.cache.outputs.cache-hit != 'true'
         run: npm install
         env:
           CI: true