Trigger kernel builds on git changes
It seems kernel changes are currently triggered by changes in the image-builder repo rather than by changes in the kernel repo. I think @dorota.czaplejewicz noticed the same for u-boot.
For the kernel it would IMHO be better to have a job with parameters that builds all flavours per repo (linux-emcraft, linux-next) that builds all flavors of a repo (nxp-evk, devkit-evk, ...) that listens for git changes there the uploading the builds debs into the repo for image-builder to fetch them from there (image-builder#4)