Copy lint from Azure Pipelines to GitHub Actions (#4058)

Copy lint from Azure Pipelines to GitHub Actions

.github/workflows/lint.yml

@@ -0,0 +1,29 @@
+name: Lint
+
+on: push
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python: [3.7]
+
+    name: Python ${{ matrix.python }}
+
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Set up Python ${{ matrix.python }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python }}
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install --upgrade tox
+
+    - name: Lint
+      run: tox -e lint