[CI] bad idea: restored the macOS build

.github/workflows/build-macos.yml

@@ -33,6 +33,11 @@ jobs:
     steps:
     - name: Checkout repository
       uses: actions/checkout@v4
+
+    - name: Install Fortran compiler
+      uses: fortran-lang/setup-fortran@v1
+      with:
+          compiler: ${{matrix.compiler}}
 
     - name: Clean up FortranCInterface_VERIFY
       # FortranCInterface_VERIFY fails on macOS, but it's not actually needed for the current build
@@ -41,7 +46,7 @@ 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}}
+      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