Add ruff linting GitHub Action

Author: mback2k

.github/workflows/ruff.yaml

@@ -0,0 +1,10 @@
+---
+name: Ruff
+on: [ push, pull_request ]
+jobs:
+  ruff:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/ruff-action@v3
+...