GH-Actions: Add Python 3.12 wheels. (#1244)

.github/workflows/build-windows.yml

@@ -180,6 +180,18 @@ jobs:
     # re-find Python, after we have changed the venv from the outside. The
     # alternative would be to clean everything, which would cause an unnecessary
     # rebuild of eCAL and HDF5 for each python Version.
+    - name: Build Python 3.12 Wheel
+      run: |
+        mkdir ".venv_312"
+        py -3.12 -m venv ".venv_312"
+        CALL ".venv_312\Scripts\activate.bat"
+        pip install wheel  setuptools
+        cmake %GITHUB_WORKSPACE% -G "Visual Studio 16 2019" -A x64 -T v142 -DPython_FIND_VIRTUALENV=FIRST
+        cmake %GITHUB_WORKSPACE% -G "Visual Studio 16 2019" -A x64 -T v142 -DPython_FIND_VIRTUALENV=ONLY
+        cmake --build . --target create_python_wheel --config Release
+      shell: cmd
+      working-directory: ${{ runner.workspace }}/_build/complete
+
     - name: Build Python 3.11 Wheel
       run: |
         mkdir ".venv_311"