[No CI] Add a gametest for startup configs

[TelepathicGrunt]

Requires neoforged/FancyModLoader#150 (comment) to be merged before gametest merge

Verifies that only Startup config will be loaded in mod init after registration of the config. Teste locally with the FML PR build and it passes
neoforged/FancyModLoader#150 (comment)

[neoforged-pr-publishing]

• Publish PR to GitHub Packages

Last commit published: 0f7e56570b4a09f52f3fd103a7f843113a070cbd.

PR Publishing

The artifacts published by this PR:

• 📦 net.neoforged:neoforge:20.6.118-beta-pr-1037-StartupConfigTest
• 📦 net.neoforged:testframework:20.6.118-beta-pr-1037-StartupConfigTest

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 #1037' // https://github.com/neoforged/NeoForge/pull/1037
        url 'https://prmaven.neoforged.net/NeoForge/pr1037'
        content {
            includeModule('net.neoforged', 'neoforge')
            includeModule('net.neoforged', 'testframework')
        }
    }
}

MDK installation

In order to setup a MDK using the latest PR version, run the following commands in a terminal.
The script works on both *nix and Windows as long as you have the JDK bin folder on the path.
The script will clone the MDK in a folder named NeoForge-pr1037.
On Powershell you will need to remove the -L flag from the curl invocation.

mkdir NeoForge-pr1037
cd NeoForge-pr1037
curl -L https://prmaven.neoforged.net/NeoForge/pr1037/net/neoforged/neoforge/20.6.118-beta-pr-1037-StartupConfigTest/mdk-pr1037.zip -o mdk.zip
jar xf mdk.zip
rm mdk.zip || del mdk.zip

To test a production environment, you can download the installer from here.

[TelepathicGrunt]

Linking #723