[CI] Add ruff check

Author: trdthg

.github/workflows/ruff.yml

@@ -0,0 +1,16 @@
+name: Lint and format
+
+on:
+  push:
+    branches: [ '**'  ]
+  workflow_dispatch:
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/ruff-action@v1
+        with:
+          args: check
+          src: "."

.gitignore

@@ -15,3 +15,6 @@ riscv-isac/riscv-env
 
 __pycache__
 riscof_work
+
+# ignore ruff cache
+.ruff_cache