cooperation request

Hi @johnstcn 👋

I'm Martin, the maintainer of the https://github.com/osscontainertools/kaniko community fork. I wanted to reach out to you to ask whether you would be interested in a cooperation on the kaniko source? We do use coder (with envbuilder) internally in my company, as such I have a bit of experience with using kaniko in this very special use-case and I think kaniko is indeed the best fit to prep an environment like this. I would like to add full support for your use-case to kaniko, I added a `--materialize` option (corresponds to your `ForceUnpack` option) previously already with that in mind, s.t. we could maybe merge the two forks together and combine our efforts going forwards. Would you be interested in such a cooperation?

I have a preliminary setup that tries to build from our fork here https://github.com/mzihlmann/envbuilder
There are still a few options missing, some have different names, but all in all I think it would not be too much effort to integrate your use-case fully.

Thank you for your consideration 🙇

Start by reviewing the preliminary envbuilder setup and the kaniko source around the existing --materialize option and the corresponding ForceUnpack option. Compare the missing or differently named options described in the issue, then define the integration scope and acceptance criteria before considering implementation.

Written by the indexing model from the issue text.