Update angular.yml

.github/workflows/angular.yml

@@ -11,9 +11,9 @@ jobs:
     runs-on: ubuntu-18.04
     steps:
       - uses: actions/checkout@v1
-      - uses: actions/setup-node@v1
+      - uses: borales/actions-yarn@v2.0.0
         with:
           node-version: '10.x'
-      - run: pwd && npm install
+      - run: pwd && yarn
         working-directory: npm/ng-packs
       - run: pwd