Actually we are using Java runtime, but it's actually written in Clojure, a dialect of Lisp, which is far, far away from Java.
Means, you want to make Injee containerized?
Will make it click to install when I have the knowledge or resource available. If you know how to convert a jar to installable, please do message me. On the other hand, than installing a backend development environment, installing java is a few clicks. Do you really think FE dev's are incapable of doing it?
Use Mastodon or Diaspora
Installing Java is few clicks, plus one extra line will give you injee. If things look very difficult, I can make it easy for you https://injee.codeberg.page/#free-support