New installations from now on will come with doas instead of sudo. This has been a long-standing request, kindly implemented by Aster. Since doas is installed with doas-sudo-shim, you can continue using doas as sudo, but please report if you encounter any issues.
If you encounter issues and want to switch back to sudo, run the following command:
doas apk add sudo !doas-sudo-shim
Existing installations will continue using sudo. To switch to using doas, run the following command:
sudo apk add doas !sudo