Version number is fixed
pip is not more strict with version verification, installation with pip results in
pip install git+https://gitlab.jsc.fz-juelich.de/eflows4hpc-wp2/airflow-datacat-integration
....
WARNING: Built wheel for airflow-datacat-integration is invalid: Metadata 1.2 mandates PEP 440 version, but 'VERSION' is not```
fix is to set version in setup.cfg