Publish to PYPI

Is available at test.pypi.org first.

.gitlab-ci.yml

@@ -33,3 +33,11 @@ tests (arch):
 tests:
   script:
     - tox -p
+
+publish:
+  rules:
+    - if: $CI_COMMIT_TAG
+  variables:
+    TWINE_REPOSITORY: testpypi
+  script:
+    - tox -e publish