pnpm in ci pipeline

.github/workflows/pipeline.yaml

@@ -23,6 +23,17 @@ jobs:
         with:
           global-json-file: global.json
 
+      - name: Use pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9
+
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: .node-version
+          cache: 'pnpm'
+
       # Begin ci-build.ps1
       - name: dotnet restore
         run: dotnet restore