Cache node_modules

.github/workflows/build.yml

@@ -30,6 +30,13 @@ jobs:
       uses: actions/setup-node@v1
       with:
         node-version: ${{ matrix.nodejs }}
+    - name: Cache node modules
+      uses: actions/cache@v2
+      env:
+        cache-name: cache-node-modules
+      with:
+        path: "**/node_modules"
+        key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
     - name: Install dependencies
       run: npm ci
     - name: Build