Add codegen backends to unit tests workflow

Author: adazem009

.github/workflows/utests.yml

@@ -13,6 +13,9 @@ jobs:
   build:
     runs-on: ubuntu-latest
 
+    matrix:
+      codegen_backend: ['llvm', 'cpp']
+
     steps:
     - uses: actions/checkout@v3
       with:
@@ -24,7 +27,7 @@ jobs:
         sudo apt-get install -y nlohmann-json3-dev libutfcpp-dev
       shell: bash
     - name: Configure CMake
-      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DLIBSCRATCHCPP_BUILD_UNIT_TESTS=ON -DLIBSCRATCHCPP_ENABLE_SANITIZER=ON
+      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DLIBSCRATCHCPP_BUILD_UNIT_TESTS=ON -DLIBSCRATCHCPP_ENABLE_SANITIZER=ON -DLIBSCRATCHCPP_CODEGEN_BACKEND=${{ matrix.codegen_backend }}
 
     - name: Build
       run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}} -j$(nproc --all)