ci: add cache process to angular action

.github/workflows/angular.yml

@@ -9,6 +9,14 @@ jobs:
     runs-on: ubuntu-18.04
     steps:
       - uses: actions/checkout@v1
+
+      - uses: actions/cache@v2
+        with:
+          path: |
+            node_modules
+            */*/node_modules
+          key: ${{ runner.os }}-${{ hashFiles('**/yarn.lock') }}
+
       - uses: actions/setup-node@v1
         with:
           node-version: '12.x'