workflow: add Qt installation step

.github/workflows/cmake-multi-platform.yml

@@ -23,9 +23,9 @@ jobs:
       #
       # To add more build types (Release, Debug, RelWithDebInfo, etc.) customize the build_type list.
       matrix:
-        os: [ubuntu-latest, windows-latest]
-        build_type: [Release]
-        c_compiler: [gcc, clang, cl]
+        os: [ ubuntu-latest, windows-latest ]
+        build_type: [ Release ]
+        c_compiler: [ gcc, clang, cl ]
         include:
           - os: windows-latest
             c_compiler: cl
@@ -54,6 +54,9 @@ jobs:
         run: |
           echo "build-output-dir=${{ github.workspace }}/build" >> "$GITHUB_OUTPUT"
 
+      - name: Install Qt
+        uses: jurplel/install-qt-action@v4
+
       - 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