Virtualenv support?

Are there any plans to make this package installable into a virtual environment?

$ cd /mnt/d/code_gis/isce3/build/packages
$ pip install isce3/

ERROR: Directory 'isce3/' is not installable. Neither 'setup.py' nor 'pyproject.toml' found.

$ find . | grep setup.py | wc -l # 0

I tried setting a few paths manually but I ended up with circular import errors.

export PATH=$PATH:/mnt/d/code_gis/isce3
export PYTHONPATH=$PYTHONPATH:/mnt/d/code_gis/isce3/build/packages
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/mnt/d/code_gis/isce3/build/lib

from isce3.core import dateTime, timeDelta, statevector, orbit, ellipsoid, lut2d
from isce3.geometry import rdr2geo_point, rdr2geo_cone
from isce3 import isceextension as ie

ImportError: cannot import name 'isce3' from partially initialized module 'isce3.ext' (most likely due to a circular import) (/mnt/d/code_gis/isce3/build/packages/isce3/ext/__init__.py)

Start by reproducing the pip install attempt from build/packages and the listed import sequence in a clean Python virtual environment. Inspect the repository's packaging layout and existing build outputs, especially the absence of setup.py and pyproject.toml. Done means the package installs into a virtual environment and the reported isce3 imports work without manually setting conflicting paths.