Cache NPM between test runs

.github/workflows/test-webapp-build.yaml

@@ -22,7 +22,7 @@ jobs:
         uses: fkirc/skip-duplicate-actions@v5
         with:
           concurrent_skipping: 'same_content_newer'
-          
+
       - name: Checkout
         uses: actions/checkout@v3
         with:
@@ -31,6 +31,18 @@ jobs:
           repository: ${{ github.event.pull_request.head.repo.full_name }}
           fetch-depth: 0
 
+      - name: Cache node modules
+        uses: actions/cache@v2
+        env:
+          cache-name: cache-node-modules-bundle-web-app
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('web/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-build-${{ env.cache-name }}-
+            ${{ runner.os }}-build-
+            ${{ runner.os }}-
+
       - name: Install Dependencies
         run: npm install