When I run newapkbuild in a container I get "ERROR: : Do not run abuild as root"

I'm trying to containerize my build work flow. I do not run Alpine on the metal or in a VM but I do launch Alpine Containers. When building a new Alpine package, I'm using newapkbuild but because I'm in a container, the container thinks it's root (though it's mapped to non-root, and the whole container is rootless). But when I run newapkbuild, I'm getting / # /usr/bin/newapkbuild mypackage >>> ERROR: : Do not run abuild as root >>> ERROR: : Do not run abuild as root