Build & test iw20gm kernel outside of cip-core/bitbake env

Issue Background

Currently iw20gm (Renesas rz/g1m) testing with b@d has required output (uimage, dtb & cpio minimal image) from cip-core https://gitlab.com/cip-project/cip-core. cip-core uses KAS (build configuration wrapped around bitbake) to produce the cip kernel & minimal image based off meta-debian deby(poky).

Issue description

As it stands b@d is about testing the kernel, b@d should use kernel-ci to provision the kernel without the overhead of bitbake/docker. Taking the config for the kernel from cip-core & applying it as is to kernel-ci build.py should be tested. After that the issue of the minimal image / ramfs can be discussed

Acceptance criteria

kernel generated via kernel-ci to produce the same test outcome as of that achieved by existing cip-core testing