work around bug in install-qt-action :)

.github/workflows/cmake.yml

@@ -61,7 +61,7 @@ jobs:
         echo "build-output-dir=${{ github.workspace }}/build" >> "$GITHUB_OUTPUT"
 
     - name: Create Qt dir on Linux
-      if: env.QT_HOST == 'linux'
+      if: matrix.os != 'windows-latest'
       run: |
         mkdir /Qt
         chmod 777 /Qt
@@ -77,6 +77,20 @@ jobs:
         dir:          '/'
         setup-python: false
 
+    - name: Fix env vars if needed
+      uses: actions/github-script@v7
+      with:
+        script: |
+          # QT_ROOT_DIR
+          if (process.env.QT_ROOT_DIR) {
+            core.exportVariable('QT_ROOT_DIR', process.env.QT_ROOT_DIR.replace(/[/\\]bin[/\\]qmake[^/\\]*/i, ""));
+            core.exportVariable('Qt6_DIR', process.env.QT_ROOT_DIR + "/lib/cmake");
+          }
+          if (process.env.QT_PLUGIN_PATH)
+            core.exportVariable('QT_PLUGIN_PATH', process.env.QT_PLUGIN_PATH.replace(/[/\\]bin[/\\]qmake[^/\\]*/i, ""));
+          if (process.env.QML2_IMPORT_PATH)
+            core.exportVariable('QML2_IMPORT_PATH', process.env.QML2_IMPORT_PATH.replace(/[/\\]bin[/\\]qmake[^/\\]*/i, ""));
+
     - name: Configure CMake
       # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
       # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type