update flake8 (#11)

.github/workflows/python-flake8.yml

@@ -0,0 +1,30 @@
+# This action is centrally managed in https://github.com/<organization>/.github/
+# Don't make changes to this file in this repo as they will be overwritten with changes made to the same file in
+# the above-mentioned repo.
+
+name: flake8
+
+on:
+  pull_request:
+    branches: [master, nightly]
+    types: [opened, synchronize, reopened]
+
+jobs:
+  flake8:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up Python
+        uses: actions/setup-python@v3  # https://github.com/actions/setup-python
+        with:
+          python-version: '3.10'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip setuptools flake8
+
+      - name: Test with flake8
+        run: |
+          python -m flake8 --verbose