APK Update cron job with auto-reboot

apk.sh

#!/bin/sh
# This script runs apk (Alpine Package Keeper) upgrade and checks if the installed kernel version differs from the running.
# If the versions differ, the system reboots.
# Script only runs on Alpine Linux.

apk -U upgrade
sync

installed_version=$(apk -I list | grep '^linux-lts' | sed -n 's/.*-\([0-9.]\+\)-r.*/\1/p')
running_version=$(uname -r | sed 's/\([0-9.]\+\)-.*/\1/')

if [ "$installed_version" != "$running_version" ]; then
  reboot
fi