Use install-qt-action on windows build as well.

.github/workflows/main.yml

@@ -45,11 +45,12 @@ jobs:
     runs-on: windows-latest
     steps:
     - uses: actions/checkout@v2
-    - name: Install QT
-      run: |
-        python -m pip install aqtinstall==1.1.3
-        python -m aqt install 5.15.2 windows desktop win64_msvc2019_64 -m qtwebengine -O D:\a\Qt
-      shell: cmd
+    - name: Install Qt 5.15.2
+      uses: jurplel/install-qt-action@v2
+      with:
+        version: "5.15.2"
+        arch: "win64_msvc2019_64"
+        modules: "qtwebengine"
     - name: Install dependencies
       run: |
         ./download_webclient.sh
@@ -73,7 +74,7 @@ jobs:
         call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
         cd build
         set PATH=%PATH%;C:\Program Files (x86)\WiX Toolset v3.11\bin;%CD%
-        cmake -GNinja -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_INSTALL_PREFIX=output -DCMAKE_MAKE_PROGRAM=ninja.exe -DQTROOT=D:/a/Qt/5.15.2/msvc2019_64 -DMPV_INCLUDE_DIR=mpv/include -DMPV_LIBRARY=mpv/mpv.dll -DCMAKE_INSTALL_PREFIX=output ..
+        cmake -GNinja -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_INSTALL_PREFIX=output -DCMAKE_MAKE_PROGRAM=ninja.exe -DQTROOT=%Qt5_DIR% -DMPV_INCLUDE_DIR=mpv/include -DMPV_LIBRARY=mpv/mpv.dll -DCMAKE_INSTALL_PREFIX=output ..
         lib /def:mpv\mpv.def /out:mpv\mpv.dll.lib /MACHINE:X64
         ninja
         ninja windows_package