some changes in CICD

.gitlab-ci.yml

@@ -13,13 +13,14 @@ cache:
 
 stages:
   - test
+  - linting
 
 .virtualenv_template: &virtualenv_definition |
   python -V
   python3 -m venv venv
   source venv/bin/activate
   pip install -U pip setuptools wheel setuptools_scm
-  pip install pytest
+  pip install pytest black
 
 
 test-python3.8:
@@ -37,6 +38,14 @@ test-python3.9:
         - pytest ./tests/test_general.py
 
 
+black:
+  stage: linting
+  # image: registry.gitlab.com/pipeline-components/black:latest
+  script:
+    - *virtualenv_definition
+    - black --check --verbose -- .
+
+
 # before_script:
 #   - python -V               # Print out python version for debugging
 #   - pip install virtualenv