Add macos to ci.yml

Author: rhpvorderman

.github/workflows/ci.yml

@@ -82,3 +82,18 @@ jobs:
       - name: Upload coverage report
         if: ${{ matrix.python-version == 3.6 && matrix.linking_method == 'static'}} # Only upload coverage once
         uses: codecov/codecov-action@v1
+
+  macos:
+    - uses: actions/[email protected]
+        with:
+          submodules: recursive
+    - name: Set up Python 3.6
+      uses: actions/[email protected]
+      with:
+        python-version: 3.6
+    - name: Install tox and upgrade setuptools and pip
+      run: pip install --upgrade tox setuptools pip
+    - name: Install yasm  # Yasm in pypa/manylinux images.
+      run: brew install yasm
+    - name: Run tests
+      run: tox -e py3