feat: add lint workflow

.github/workflows/lint.yml

@@ -0,0 +1,35 @@
+name: Lint
+
+# If a pull-request is pushed then cancel all previously running jobs related
+# to that pull-request
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true 
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+      - master
+
+env:
+  PY_COLORS: 1
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4.1.1
+        with:
+          fetch-depth: 0
+      - name: Install poetry
+        run: pipx install poetry
+      - uses: actions/setup-python@v5.0.0
+        with:
+          python-version: '3.12'
+      - run: poetry install
+      - name: Run flake8 (https://flake8.pycqa.org/en/latest/)
+        run: poetry run flake8