allow CI to fail if ruff or black is unhappy, and format source to make it pass

.gitlab-ci.yml

 image: python:latest
 
 stages:
-  - test-style
   - test
 
 before_script:
-   - cat /etc/issue
-   - python -V
-   - which python
-   - python -m venv ../venv
-   - source ../venv/bin/activate
-   - which python
-   - pwd
-   - pip install -U pip
-   - pip --version
-   - pip install pytest black ruff
-   - pytest --version
-
-  
+  - cat /etc/issue
+  - python -V
+  - which python
+  - python -m venv ../venv
+  - source ../venv/bin/activate
+  - which python
+  - pwd
+  - pip install -U pip
+  - pip --version
+  - pip install pytest black ruff
+  - pytest --version
+
 style:
-  stage: test-style
+  stage: test
   image: python:latest
   script:
     - black --version
     - ruff --version
-    - ruff . || true
-    - black --check --diff . || true
+    - ruff .
+    - black --check --diff .
 
 
 test3-09:
@@ -49,4 +47,3 @@ test3-11:
   script:
     - echo "run tests here later"
     - python --version
-