Refactor bundlewatch workflow to use Turbo (#2119)

.github/workflows/test.yml

@@ -1,8 +1,7 @@
 name: Test build
 
 on:
-  pull_request:
-    types: [ opened, reopened ]
+  pull_request: null
 
 env:
   NODE: 20
@@ -17,6 +16,14 @@ jobs:
       - name: Clone repository
         uses: actions/checkout@v4
 
+      - name: Cache turbo build setup
+        uses: actions/cache@v4
+        with: 
+          path: .turbo
+          key: ${{ runner.os }}-turbo-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-turbo-
+
       - name: Set up Node.js
         uses: actions/setup-node@v4
         with: