Cache Node.js modules

.github/workflows/validate-fsh.yml

@@ -12,16 +12,24 @@ jobs:
     steps:
     - name: Checkout repository
       uses: actions/checkout@v4
-
+      
     - name: Setup Node.js
       uses: actions/setup-node@v4
       with:
         node-version: '16'
-
-    - name: Set up Python
+        
+    - name: Setup Python
       uses: actions/setup-python@v5
       with:
         python-version: '3.x'
+
+    - name: Cache Node.js modules
+      uses: actions/cache@v4
+      with:
+        path: ~/.npm
+        key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-node-
 
     - name: Install fsh-sushi
       run: npm install -g fsh-sushi