Revert "Merge branch 'simon/hatch_publish' into 'master'"

This reverts merge request !125 (merged)

.gitlab-ci.yml

@@ -43,7 +43,8 @@ pypi:
     - job: "build"
       artifacts: true
   script:
-      - python -m hatch publish -y
+      - pip install -U twine
+      - twine upload -u "$TWINE_USERNAME" -p "$TWINE_PASSWORD" dist/*
   rules:
     - if: '$CI_COMMIT_TAG =~ /^v\d{4}\.\d{1,2}\.\d{1,2}$/'
       # Always publish tagged commits matching CalVer