Adding macos to the build matrix

.github/workflows/build.yml

@@ -10,10 +10,10 @@ jobs:
       matrix:
         include:
           - os: ubuntu-latest
-            runtime: linux-x64
             name: Linux
+          - os: macOS-latests
+            name: MacOS
           - os: windows-latest
-            runtime: win-x64
             name: Windows
     steps:
       - uses: actions/checkout@v1
@@ -31,4 +31,4 @@ jobs:
       - name: CheckBinaryName
         shell: bash
         if: matrix.name == 'Linux'
-        run: test -f build/bomberman
+        run: test -f build/bomberman