Automatically install a server on headless environments

[Matyrobbrt]

This PR makes the installer automatically install a server on headless environments without needing the --install-server option specified. This should reduce user confusion when they try to simply run the jar on a server

[neoforged-pr-publishing]

• Publish PR to GitHub Packages

Last commit published: 45da65f9df0d03ea973f7b969f79d077bd603103.

PR Publishing

The artifacts published by this PR:

• 📦 net.neoforged:legacyinstaller:3.0.35-pr-38-auto-headless-server

Repository Declaration

In order to use the artifacts published by the PR, add the following repository to your buildscript:

repositories {
    maven {
        name 'Maven for PR #38' // https://github.com/neoforged/LegacyInstaller/pull/38
        url 'https://prmaven.neoforged.net/LegacyInstaller/pr38'
        content {
            includeModule('net.neoforged', 'legacyinstaller')
        }
    }
}

[neoforged-releases]

🚀 This PR has been released as LegacyInstaller version 3.0.34.