Add initial Python CI configuration.

.gitlab-ci.yml

@@ -576,4 +576,37 @@ sanity:
     policy: pull
     key: "${CI_COMMIT_REF_SLUG}-gcc"
 
-
+##########################################################
+# template for all Python jobs
+.python:
+  stage: python
+  tags:
+    - corsika
+  before_script:
+    - apt-get update && apt-get install -y python3-pip
+  script:
+    - cd ${CI_PROJECT_DIR}/Python  # change into the Python directory
+    - pip3 install --user -e '.[test]'  # install the package + test deps
+    - python3 --version
+    - python3 -m mypy corsika
+    - python3 -m isort --atomic --check-only corsika tests
+    - python3 -m black -t py37 corsika tests
+    - python3 -m flake8 corsika tests
+    - python3 -m pytest --cov=corsika tests
+    - cd ${CI_PROJECT_DIR}  # reset the directory
+  coverage: '/^TOTAL\s*\d+\s*\d+\s*(.*\%)/'
+
+# the default Python version Ubuntu 18.04 is Python3.8
+python-3.8:
+  extends: .python
+  image: corsika/devel:u-18.04
+  dependencies:
+    - build-u-18_04
+  cache:
+    key: "${CI_COMMIT_REF_SLUG}-gcc"
+  artifacts:
+    when: always
+    expire_in: 1 year
+    paths:
+      - ${CI_PROJECT_DIR}/Python/python-test.log
+  allow_failure: true