add ruff gha

Author: phobson

.github/workflows/python-ruff.yml

@@ -0,0 +1,19 @@
+name: ruff 'n' stuff
+on: [pull_request]
+
+jobs:
+    build:
+      runs-on: ubuntu-latest
+      steps:
+        - uses: actions/checkout@v3
+        - name: Install Python
+          uses: actions/setup-python@v4
+          with:
+            python-version: "3.12"
+        - name: Install dependencies
+          run: |
+            python -m pip install --upgrade pip
+            pip install ruff
+        # Update output format to enable automatic inline annotations.
+        - name: Run Ruff
+          run: ruff check --output-format=github .