fixup! Upgrade to install-qt-action@v4

Author: hasselmm

.github/workflows/integration.yaml

@@ -83,8 +83,24 @@ jobs:
               '-GXcode',
             ]
 
-          - platform: ['linux', 'mingw-gcc', 'mingw-llvm']
-            cmake-flags: ['-GNinja']
+          - platform: linux
+            cmake-flags: [
+              '-GNinja'
+            ]
+
+          - platform: mingw-gcc
+            cmake-flags: [
+              '-DCMAKE_CXX_COMPILER:STRING=g++',
+              '-DCMAKE_C_COMPILER:STRING=gcc',
+              '-GNinja',
+            ]
+
+          - platform: mingw-llvm
+            cmake-flags: [
+              '-DCMAKE_CXX_COMPILER:STRING=clang++',
+              '-DCMAKE_C_COMPILER:STRING=clang',
+              '-GNinja',
+            ]
 
         exclude:
           - platform: mingw-llvm
@@ -186,7 +202,7 @@ jobs:
         working-directory: ${{runner.workspace}}/build
         run: cmake ${{github.workspace}}
                 -DCMAKE_BUILD_TYPE:STRING=Release
-                -DQT_DIR:PATH=$QT_ROOT_DIR
+                -DQT_DIR:PATH=$QT_ROOT_DIR/lib/cmake
                 ${{ join(matrix.cmake-flags, ' ') }}
 
       - uses: actions/upload-artifact@v4