Add linting stage

.gitlab-ci.yml

 stages:
+ - linting
  - test
  - deploy
 
@@ -112,6 +113,13 @@ run-vhdl-tests:
       - cd b_asic/codegen/testbench
       - python test.py
 
+ruff:
+  stage: linting
+  image: registry.gitlab.com/pipeline-components/ruff:latest
+  before_script: []
+  script:
+    - ruff --format=gitlab .
+
 run-doc-test:
   variables:
     QT_API: pyside2