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overlay/
This directory follows similar rules to the pre-build.d/ directory, except it is applied after the chroots are prepared (as it is designed to be user-centric rather than core functionality). We’ll go more into this later in-depth, as this is where most of your customizations will be done.
For files that should be included in both chroots, simply recreate the path with the desired file. For instance, if you want a file /etc/foo/bar.conf to exist in both i686 and x86_64 versions, it would exist as the path overlay/etc/foo/bar.conf.
It follows the following structure:
i686/
This contains modifications that should be applied to the i686 version only. If you wanted a file to exist only in the i686 version at /etc/a/b.conf, it would be placed in overlay/i686/etc/a/b.conf.
x86_64/
This contains modifications that should be applied to the x86_64 version only. If you wanted a file to exist only in the x86_64 version at /etc/z/y.conf, it would be placed in overlay/x86_64/etc/z/y.conf.