Script that installing Alpine chroot in all UNIX systems with busybox and/or coreutils ( including Android ) to install this in Android you need only root, busybox and Terminal emulator
to install this run this commands:
cp /path/to/install.sh ~/
su
cd ~/
chmod 777 installer.sh
./installer.sh
now you can run it with
./start.sh
all settings saved in script as variables! you can edit $ARCH variable to install Alpine chroot for any CPU architecture