[CI] testing macOS build with based on fortran-lang/setup-fortran@v1

.github/workflows/build-macos.yml

@@ -28,21 +28,19 @@ jobs:
       matrix:
         os: [macos-latest]
         architecture: [x64, arm64]
+        toolchain: {compiler: gcc, version: 12}
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: fortran-lang/setup-fortran@v1
 
     - name: Clean up FortranCInterface_VERIFY
       # FortranCInterface_VERIFY fails on macOS, but it's not actually needed for the current build
       run: sed -i".backup" 's/FortranCInterface_VERIFY(CXX)/# FortranCInterface_VERIFY(CXX)/g' ${{github.workspace}}/CMakeLists.txt
 
-    - name: Install gfortran
-      run: brew install gfortran
-
     - 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}} -DCMAKE_Fortran_COMPILER=/usr/local/bin/gfortran
+      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DCMAKE_Fortran_COMPILER=${{env.FC}}
 
     - name: Build
       # Build your program with the given configuration