Hi,

I'm running the latest-stable branch on a RPI in diskless mode.
I just created this simple script to update both packages and
kernel/firmware automatically.

https://github.com/jmarcgit/rpi-alpine-update

The logic is to update the apk packages first. If the release version of
the boot partition doesn't match the release version of the distro anymore
then the script downloads the new RPI boot image and unpack it
automatically. The previous version is archived in a subdirectory so if
anything goes wrong it's easy to rollback.

Comments are welcome !