Specify gcc-10 in the actions

.github/workflows/build.yml

@@ -27,7 +27,7 @@ jobs:
     - name: Configure CMake
       # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
       # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type
-      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DUSE_WERROR=ON
+      run: cmake -B ${{github.workspace}}/build -D CMAKE_C_COMPILER=gcc-10 -D CMAKE_CXX_COMPILER=g++-10 -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DUSE_WERROR=ON
 
     - name: Build
       # Build your program with the given configuration