Missing documentation on how to build naxsi for alpine linux

[Tox46]

I'm trying to install naxsi on my alpine/nginx docker image and it's not clear which steps should i follow: installing documentation only mentions building Ubuntu/Debian and compiling from source, even if inside your release page you have packages for Ubuntu, Debian and Alpine other than the source code.

Maybe it's obvious for most people, but if it's not for me, chances are there’s someone out there just like me.