Add gitlab CI .yml

.gitlab-ci.yml

+image: clarinpl/python:3.8
+
+cache:
+  paths:
+    - .tox
+stages:
+  - publish
+
+before_script:
+  - apt-get update -yqq
+    && apt-get install -yqq --no-install-recommends
+    make
+    g++
+    && apt-get autoremove -yqq --purge
+    && apt-get clean
+
+pypi_publish:
+  before_script:
+   - pip install twine
+  only:
+   - main
+  stage: publish
+  script:
+    - python -m build
+    - python -m twine upload
+     --skip-existing
+     --repository-url https://pypi.clarin-pl.eu/
+     -u $PIPY_USER
+     -p $PIPY_PASS
+     dist/lambo*.whl