feat(actions): bring back qt caching

Signed-off-by: DioEgizio <83089242+DioEgizio@users.noreply.github.com>

.github/workflows/build.yml

@@ -28,6 +28,7 @@ jobs:
             qt_host: linux
             qt_version: '6.3.1'
             qt_modules: 'qt5compat qtimageformats'
+            qt_path: /home/runner/work/PolyMC/Qt
 
           - os: windows-2022
             name: "Windows-Legacy"
@@ -45,6 +46,7 @@ jobs:
             qt_host: mac
             qt_version: '6.3.1'
             qt_modules: 'qt5compat qtimageformats'
+            qt_path: /Users/runner/work/PolyMC/Qt
 
     runs-on: ${{ matrix.os }}
 
@@ -140,6 +142,14 @@ jobs:
         run: |
           sudo apt-get -y install qtbase5-dev qtchooser qt5-qmake qtbase5-dev-tools libqt5core5a libqt5network5 libqt5gui5
            
+      - name: Cache Qt (macOS and AppImage)
+        id: cache-qt
+        if: matrix.qt_ver == 6 && runner.os != 'Windows'
+        uses: actions/cache@v3
+        with:
+          path: '${{ matrix.qt_path }}/${{ matrix.qt_version }}'
+          key: ${{ matrix.qt_host }}-${{ matrix.qt_version }}-"${{ matrix.qt_modules }}"-qt_cache
+
       - name: Install Qt (macOS and AppImage)
         if: matrix.qt_ver == 6 && runner.os != 'Windows'
         uses: jurplel/install-qt-action@v2
@@ -148,6 +158,7 @@ jobs:
            host: ${{ matrix.qt_host }}
            target: 'desktop'
            modules: ${{ matrix.qt_modules }}
+           cached: ${{ steps.cache-qt.outputs.cache-hit }}
            aqtversion: ==2.1.*
 
       - name: Prepare AppImage (Linux)