[Buildroot] add user script to /etc/rc before rootfs is created

[hong zhang]

List,
I add user script to /etc/rc/... so that the script can be executed right after kernel is up.
What I am doing now is:After building first rootfs, expand rootfs and add my script to /etc/rc... area.

Is it possible to add my script to buildroot before rootfs is created?
---henry
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