Alpine Linux attempt log

You may want to look at that post.

Also, ClockworkPi uConsole (clockworkpi-uconsole-rpi) - postmarketOS Wiki.

postmarketOS is actually based on Alpine Linux, though lately its init system is shifted to systemd, not OpenRC.

If you insist making a pure Alpine Linux image instead, perhaps it would be wise to look into what the postmarketOS contributors did.