lint multiple py versions

Author: abe-winter

.github/workflows/lint.yml

@@ -4,9 +4,14 @@ on:
 jobs:
   lint:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        py_version: ["3.9", "3.10", "3.11"]
     steps:
     - uses: actions/checkout@v4
     - uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.py_version }}
     - name: install
       run: pip install ruff
     - name: check