Alternate image layout in rpm2img

[arnaldo2792]

What I'd like:
As part of #1799, we will add support for NVIDIA GPUS. However, additional libraries provided by the .run script are required for all GPU workloads to work. The space required for the libraries is around ~432M, which causes build errors because the image size isn't sufficient. Since we don't want to increase the size of the image for all variants, we need to change rpm2img so that we can have alternate image layouts, depending on the variant being built.

Any alternatives you've considered:
N / A