Initial linting CI checks

.woodpecker/lint.yml

@@ -0,0 +1,10 @@
+when:
+  branch: main
+steps:
+  - name: lint
+    image: python:3-alpine
+    commands:
+      - python -m pip install --upgrade pip
+      - python -m pip install -r requirements.txt
+      - python -m pip install ruff
+      - ruff check .