Add linters

.gitlab-ci.yml

@@ -1,3 +1,31 @@
+---
+run pylint:
+  stage: test
+  image: python:3.9
+  script:
+    - pip install --upgrade pylint
+    - pylint $(git ls-files '*.py')
+  tags:
+    - docker
+
+run flake8:
+  stage: test
+  image: python:3.9
+  script:
+    - pip install --upgrade flake8
+    - flake8 $(git ls-files '*.py')
+  tags:
+    - docker
+
+run mypy:
+  stage: test
+  image: python:3.9
+  script:
+    - pip install --upgrade mypy
+    - mypy --install-types --non-interactive $(git ls-files '*.py')
+  tags:
+    - docker
+
 run tests:
   stage: test
   image: python:3.9