Lint with GitHub Actions

.github/workflows/lint.yml

@@ -0,0 +1,43 @@
+name: Lint
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.8]
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: pip cache
+        uses: actions/cache@v1
+        with:
+          path: ~/.cache/pip
+          key: ${{ matrix.os }}-pip-${{ hashFiles('**/setup.py') }}
+          restore-keys: |
+            ${{ matrix.os }}-pip-
+
+      - name: pre-commit cache
+        uses: actions/cache@v1
+        with:
+          path: ~/.cache/pre-commit
+          key:
+            ${{ matrix.os }}-pre-commit-${{ hashFiles('**/.pre-commit-config.yaml') }}
+          restore-keys: |
+            ${{ matrix.os }}-pre-commit-
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install --upgrade tox
+
+      - name: Lint
+        run: tox -e lint