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 🙇