CI: disable macOS build temporarily

No time to solve it now!

Author: ctrueden

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        os: [ubuntu-latest, windows-latest]
 
     steps:
       - uses: actions/checkout@v2