Alpine Linux is supported by an upstream .apk package, or a manual .tar.gz install, or by a container.
These instructions on this page are quite basic, because not many people have tried to use OliveTin on Alpine, or other OpenRC distributions. If you can help suggest improvements to these docs, or Alpine Linux support, it would be great to hear from you!
user@host: wget https://github.com/OliveTin/OliveTin/releases/latest/download/OliveTin_linux_amd64.apk user@host: apk add --allow-untrusted OliveTin_linux_amd64.apk
The standard .tar.gz instructions should work just fine, replacing systemd for the OpenRC file.