Run linting as part of CI

Author: jwodder

.github/workflows/lint.yml

@@ -0,0 +1,27 @@
+name: Linters
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up environment
+        uses: actions/checkout@v3
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '^3.8'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install --upgrade tox
+
+      - name: Run linters
+        run: tox -e lint