ruff in the CI

.github/workflows/lint.yml

@@ -0,0 +1,28 @@
+name: Lint
+
+on:
+  push
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.7']
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+          python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      shell: bash
+      run: pip install -r requirements_dev.txt
+
+    - name: Run ruff
+      shell: bash
+      run: ruff instld