setup CI for tests

.gitlab-ci.yml

 image: gitlab.kwant-project.org:5005/qt/research-docker
 
-stages:
-  - run profiler
-  
-variables:
-  GIT_SUBMODULE_STRATEGY: recursive
-
-before_script:
-  - shopt -s nullglob  # sane behaviour when globs do not match
-  - pip install gitlab-ci-tools  # for last-good-build
-  - LAST_GOOD_SHA=$(last-good-build || echo '')
-
 run profiler:
   script:
     - cd codes; export PYTHONPATH="."; cd ..
     - pip install memray pyinstrument
     - python profiling/graphene.py
-  stage: run profiler
   artifacts:
     paths:
       - timeProfile.html
       - memoryProfile.bin
 
+run tests:
+  # Needed because of coverage reports
+  script:
+    - pip install pytest-cov pytest-randomly pytest-repeat pytest-ruff pytest-regressions
+    - py.test
+  coverage: '/(?i)total.*? (100(?:\.0+)?\%|[1-9]?\d(?:\.\d+)?\%)$/'
+  artifacts:
+    paths:
+      - htmlcov
+    reports:
+      junit: junit.xml
+      coverage_report:
+        coverage_format: cobertura
+        path: coverage.xml