Try OSX CI on workflows

Author: rocky

.github/workflows/basic.yml

@@ -1,4 +1,4 @@
-name: Mathics (basic)
+name: Mathics (ubuntu)
 
 on:
   push:

.github/workflows/osx.yml

@@ -0,0 +1,33 @@
+name: Mathics (OSX)
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [macOS]
+        python-version: [3.6, 3.7, 3.8]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        # brew install liblapack-dev llvm-dev
+        python -m pip install --upgrade pip
+    - name: Install Mathics
+      run: |
+        sed -i "s/'sympy==[0-9]\.[0-9]\.[0-9]', //" setup.py
+        make
+    - name: Test Mathics
+      run: |
+        pip install pytest pexpect
+        make -j3 check