Install g++ too

Author: loonycyborg

.github/workflows/runtest.yml

@@ -39,7 +39,7 @@ jobs:
           python -m pip install --upgrade pip setuptools wheel
           python -m pip install ninja psutil
           # sudo apt-get update
-          sudo apt-get install gcc-12
+          sudo apt-get install gcc-12 g++-12
           sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-12 100
           sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-12 100
       - name: runtest ${{ matrix.os }}