ci: switch CI from Forgejo Actions to Woodpecker CI

.woodpecker/style.yaml

@@ -0,0 +1,18 @@
+# Links & Resources
+# - https://hub.docker.com/_/python
+# - https://docs.astral.sh/ruff/installation/
+# - https://black.readthedocs.io/en/stable/usage_and_configuration/black_docker_image.html
+
+when:
+  event: [push, pull_request]
+
+steps:
+  - name: ruff
+    image: python
+    commands:
+      - pip install ruff
+      - ruff check .
+  - name: black
+    image: pyfound/black
+    commands:
+      - black --check --diff .