Add style check GitHub workflow

.github/workflows/style-check.yml

@@ -0,0 +1,35 @@
+# Based on https://github.com/psf/black/actions/runs/17913292/workflow
+
+name: Style check
+on:
+  push:
+    paths:
+      - '**.py'
+  pull_request:
+    paths:
+      - '**.py'
+jobs:
+  black:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python 3.10
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.10'
+      - name: Install Black
+        run: pip install black
+      - name: Run black check
+        run: black --check .
+  isort:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python 3.10
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.10'
+      - name: Install isort
+        run: pip install isort
+      - name: Run isort check
+        run: isort --check-only .