I was facing the same issue... I was able to resolve it using Pip install issue with egg fragments that lead to an UNKNOWN installation of a package

create a file called setup.py inside your .tar.gz package with the following content:

from setuptools import setup, find_packages

setup(name='netboxlabs-diode-netbox-plugin',
      version='0.6.0',
      packages=find_packages(),
     )