Basic macOS dmg generation

.github/workflows/build.yml

@@ -125,6 +125,8 @@ jobs:
         cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release
         cmake --build build
         echo "VERSION=$(cat build/version.txt)" >> $GITHUB_ENV
+        cpack --config build/CPackConfig.cmake -B build/installer --verbose
+        mv build/installer/*.dmg build/Release
     - name: Upload
       uses: actions/upload-artifact@v4
       with: