Persistence Options + Comprehensive README

[AngriestBird]

Changes

• Adds persistence options for the Dockerfile
• Comprehensive improvements to the Dockerfile

Issues

Adds instructions in README to enable persistence as well as additional information and places for documentation.

Closes #44

[jacksga]

Hey @BrettMayson / @coyotan,

any chance you or one of your colleagues could take a look at this and maybe merge it? I'd love to have persistence :)

[Copilot]

Pull request overview

This PR adds optional persistence configuration support to the container startup flow and significantly expands the README to document available environment variables (including persistence-related settings), addressing the “Persistence How?” documentation gap (Issue #44).

Changes:

• Add PERSISTENCE_* environment variables and inject a game.gameProperties.persistence section into the generated server config when set.
• Add a persistence_default.json template file and copy it into the image.
• Expand README variable documentation across Steam/Network/RCON/Game/Game Properties/Persistence sections.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
README.md	Adds comprehensive ENV documentation and a new Persistence section with examples/links.
launch.py	Generates persistence config in docker_generated.json when PERSISTENCE_* envs are provided.
Dockerfile	Introduces PERSISTENCE_* env defaults and includes persistence_default.json in the image.
persistence_default.json	Provides a default/template persistence JSON structure (databases/storages).
.gitignore	Ignores reforger/ directory artifacts.

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[AngriestBird]

@BrettMayson I resolved the immediate comments. Please let me know if there's any other gaps. I do have a follow-up feature branch that implements ALL 1.6 parameters and updated docs as well we can start to look at as well as upgraded the container to a new version.