This is the baremetal (IE: real hardware) element.
Does the following:
extracts the kernel and initial ramdisk of the built image.
DIB_BAREMETAL_KERNEL_PATTERN and DIB_BAREMETAL_INITRD_PATTERN may be supplied to specify which kernel files are preferred; this can be of use when using custom kernels that don’t fit the standard naming patterns. Both variables must be provided in order for them to have any effect.