Use a different CI template

.gitlab-ci.yml

-image: clarinpl/python:3.8
+image: python:latest
 
-stages:
-  - publish
-
-pypi_publish:
-  before_script:
-   - apt-get -y install python3-venv
-   - pip install build setuptools wheel
-   - pip install twine
-  only:
-   - master
-  stage: publish
+run:
   script:
+    - pip install build twine
     - python -m build
     - python -m twine upload
      --skip-existing