ci: Enable ruff checks

.gitlab-ci.yml

@@ -20,6 +20,17 @@ test-isort:
     - isort --check .
   interruptible: true
 
+test-ruff:
+  image: gajim-test
+  stage: test
+  rules:
+    - changes:
+      - "**/*.py"
+  script:
+    - ruff --version
+    - ruff check .
+  interruptible: true
+
 test-black:
   image: gajim-test
   stage: test

.pre-commit-config.yaml

@@ -3,7 +3,6 @@ repos:
     rev: v0.6.8
     hooks:
       - id: ruff
-        stages: [manual]
         exclude: ".githooks/"
 
   - repo: https://github.com/codespell-project/codespell