Add Ruff linter in CI

.drone.yml

@@ -0,0 +1,13 @@
+kind: pipeline
+name: default
+type: docker
+
+on:
+  push:
+
+steps:
+  - name: lint
+    image: python:3.12
+    commands:
+      - pip install --root-user-action=ignore -r requirements.txt
+      - ruff check .

requirements.txt

@@ -0,0 +1,5 @@
+matplotlib>=3.5.0
+pandas>=1.5.0
+seaborn>=0.12.0
+streamlit>=1.35.0
+ruff>=0.4.8