build-kernel.sh: Ship additional files to INITRD_DIR via variable

Mattijs Korpershoekrequested to merge
mkorpershoek-rh/kernel-scripts:copy-files into main

In order to bundle other test applications such as spidev_test, we can use the ADDITIONAL_FILES variables.

Note that tools need to be statically compiled to be useable.

Signed-off-by: Mattijs Korpershoek mkorpershoek@redhat.com

Edited by Mattijs Korpershoek

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