Add macos to CI (#72)

Closes #70

.github/workflows/cmake.yml

@@ -12,26 +12,31 @@ env:
 jobs:
   build:
     name: Running unit tests with ${{matrix.ctest_option}} option
-    runs-on: ubuntu-latest
     strategy:
       matrix:
         ctect_option:
           - "-DBESM666_TEST_WITH_VALGRIND=OFF"
           - "-DBESM666_TEST_WITH_VALGRIND=ON"
+        os: [ ubuntu-latest, macos-12 ]
+    runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v3
       with:
         submodules: recursive
 
     - name: install valgrind
+      if: ${{ matrix.os != 'macos-12' }}
       run: sudo apt update && sudo apt install -y valgrind
 
     - name: Configure CMake
+      if: ${{ !(matrix.os == 'macos-12' && matrix.ctect_option == '-DBESM666_TEST_WITH_VALGRIND=ON') }}
       run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} ${{matrix.ctect_option}}
 
     - name: Build
+      if: ${{ !(matrix.os == 'macos-12' && matrix.ctect_option == '-DBESM666_TEST_WITH_VALGRIND=ON') }}
       run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}
 
     - name: Test
+      if: ${{ !(matrix.os == 'macos-12' && matrix.ctect_option == '-DBESM666_TEST_WITH_VALGRIND=ON') }}
       working-directory: ${{github.workspace}}/build
       run: ctest --test-dir ${{github.workspace}}/build/besm-666