Add caching to Rich Navigation step to reuse node_modules

.github/workflows/rich-navigation.yml

@@ -10,10 +10,21 @@ jobs:
     runs-on: windows-latest
     steps:
     - uses: actions/checkout@v2
+
+    - uses: actions/cache@v2
+      id: caching-stage
+      name: Cache VS Code dependencies
+      with:
+        path: node_modules
+        key: ${{ runner.os }}-dependencies-${{ hashfiles('yarn.lock') }}
+        restore-keys: ${{ runner.os }}-dependencies-
+
     - name: Install dependencies
+      if: steps.caching-stage.outputs.cache-hit != 'true'
       run: yarn --frozen-lockfile
       env:
         CHILD_CONCURRENCY: 1
+
     - uses: microsoft/RichCodeNavIndexer@v0.1
       with:
         languages: typescript