split packages

How to customise /etc/fstab per image ? /etc/fstab is provided by base-files.

• create base-files-X and base-files-Y packages with the same content as base-files with only changed /etc/fstab: https:// yocto.yoctoproject.narkive.com/XcannnRd/per-image-customizations
• Search in Yocto for python populate_packages and see what others do