Package build trees or package build configuration

@prabhuramachandran we would like to create Python packages for the [ITK-VTK Glue](https://blog.kitware.com/how-to-connect-itk-and-vtk-pipelines/) from [this ITK module](https://github.com/InsightSoftwareConsortium/ITKVTKGlue).

We publish the [ITK Python package build trees](https://github.com/InsightSoftwareConsortium/ITKPythonBuilds) so we can build [Python packages from ITK modules on GitHub](https://itkpythonpackage.readthedocs.io/en/latest/Build_ITK_Module_Python_packages.html).

For the *itk-vtkglue* Python package, we will also need the VTK sources, compiler, configuration -- and the build tree would be nice. Is it possible to get tarballs of the VTK build tree and source tree that was used to create the Python packages uploaded to PyPI? Or, can you just list what compiler, VTK version, and build configurations were used?

@jcfr @demarle

Start by reading the ITKPythonBuilds documentation and the VTK Python package build process linked in the issue. Determine whether the VTK source and build trees can be published, or document the compiler, VTK version, and build configuration used; done means the requested reproducibility information or build artifacts are available.

Written by the indexing model from the issue text.