experiment with node_modules caching in e2e workflow [vercel skip]

.github/workflows/playwright.yml

@@ -15,7 +15,15 @@ jobs:
     - uses: actions/setup-node@v3
       with:
         node-version: 16
+    - name: Cache node modules
+        uses: actions/cache@v3
+        id: cache_node_modules
+        with:
+          # caching node_modules
+          path: node_modules
+          key: node_modules-${{ hashFiles('yarn.lock') }}
     - name: Install dependencies
+      if: steps.cache_node_modules.outputs.cache-hit != 'true'
       run: npx lerna bootstrap
     - name: Prebuild
       run: npx lerna run prebuild