Test cache of Qt

.github/workflows/AppFwkUnitTest.yml

@@ -11,12 +11,18 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v1
-      - name: Install Qt
-        uses: jurplel/install-qt-action@v2.5.0
-        with:
-          version: 5.9.9
-          modules: qtscript 
-          mirror: 'http://mirrors.ocf.berkeley.edu/qt/'
+      - name: Cache Qt
+          id: cache-qt
+          uses: actions/cache@v1
+          with:
+            path: ../Qt
+            key: ${{ runner.os }}-QtCache
+        - name: Install Qt
+          uses: jurplel/install-qt-action@v2
+          with:
+            version: 5.9.9
+            modules: qtscript 
+            cached: ${{ steps.cache-qt.outputs.cache-hit }}
       - name: Install Linux dependencies
         if: "contains( matrix.os, 'ubuntu')"
         run: sudo apt-get install libxkbcommon-x11-0 libgl1-mesa-dev mesa-common-dev libglfw3-dev libglu1-mesa-dev