Better tutorial (a little bit more complicated): https://gist.github.com/karolba/a3f1c5f8d50c67f5a19e6c8f38e53e12

-------------

1. Download the "virtual" type aarch64 ISO file from https://www.alpinelinux.org/downloads/ with wget
2. Execute `sudo dd if=alpine.iso of=/dev/sda`
3. On the Oracle Cloud panel, setup a console connection and connect to the serial console.
4. Execute `sudo reboot`
5. When Alpine is launched and you are logged in as root, execute these commands in the serial console:
```
mkdir /media/setup
cp -a /media/sda/* /media/setup
mkdir /lib/setup
cp -a /.modloop/* /lib/setup
/etc/init.d/modloop stop
umount /dev/sda
mv /media/setup/* /media/sda/
mv /lib/setup/* /.modloop/
```
6. Complete the setup with `setup-alpine`