Add an option to download the server starter jar

[Matyrobbrt]

--server.jar will download the server starter and place it in the server dir as server.jar

[neoforged-pr-publishing]

• Publish PR to GitHub Packages

Last commit published: f0259c885de78c78b7fcfceeee0b0c239a964c66.

PR Publishing

The artifacts published by this PR:

• 📦 net.neoforged:legacyinstaller:3.0.25-pr-25-server-starter-jar

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 #25' // https://github.com/neoforged/LegacyInstaller/pull/25
        url 'https://prmaven.neoforged.net/LegacyInstaller/pr25'
        content {
            includeModule('net.neoforged', 'legacyinstaller')
        }
    }
}