board/MynaPlayer odyssey: add pre-init script to setup overlay filesystem.
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This adds a pre-init script that is ran before systemd. This scripts prepares the system so that the rootfs will be left unaltered, but combines it with a writable ext4 filesystem, where data can be stored. Both rootfs use the same overlay, which makes it possible to preserve data while overriding one of the rootfs during an upgrade.
Xogium
committed
on 19 Sep 2020