Update macos.yml

Author: williamniemiec

.github/workflows/macos.yml

@@ -14,10 +14,10 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Build
-      run: cmake -S ${{github.workspace}} -B ${{github.workspace}}/build
+      run: cmake -S ${{github.workspace}} -B ${{github.workspace}}/build -G "Unix Makefiles"
 
     - name: Configure build directory
       run: cmake --build build
 
     - name: Run tests
-      run: cd build && ctest
+      run: cd build && ctest