Pie-models

* update release instructions (29) ArneBinder
* add Labeler CI workflow (28) ArneBinder
* add (test-)pypi and github release workflows (26) ArneBinder
* use poetry (25) ArneBinder
* integrate codecov (24) ArneBinder

:beetle: Fixes

* fix labeler workflow (30) ArneBinder
* Fix release and dependencies (27) ArneBinder

**Full Changelog**: https://github.com/ArneBinder/pie-models/compare/v0.3.0...v0.4.0

New Contributors
* leonhardhennig made their first contribution in https://github.com/ArneBinder/pie-models/pull/10

**Full Changelog**: https://github.com/ArneBinder/pie-models/compare/v0.2.0...v0.3.0

**Full Changelog**: https://github.com/ArneBinder/pie-models/compare/v0.1.0...v0.2.0

New Contributors
* ArneBinder made their first contribution in https://github.com/ArneBinder/pie-models/pull/1

**Full Changelog**: https://github.com/ArneBinder/pie-models/commits/v0.1.0