feat: Single File Injections

[DomiIRL]

Hey @jeremylvln,

I have another draft for you again.
This time it should be something a little bit more functional but sadly I wasn't able to get the operator running with my changes so I wasn't able to test my changes :/

This new feature will allow for a single file to be added after patches at a specific location and with a custom name allowing to:

• Work around maven file name conflicts (strict structures and third party repositories may cause problems from my experience)
• Add mods in the /mod folder
• Any other custom jar or arbitrary files people may want (In my case addon jar files in a /addon folder)
• Also reduces the need for CI Workflows for files at specific locations as well as maintenance for all of these workflows and moves the responsibility of file structure to the deployment alone.

I also think the addition of defining a specific path where a file should be added could definitely enhance patches in the future.

Currently I've only implemented the feature for game servers but from what I've seen it should be possible to apply the same logic to the proxy. I also added some documentation :)

Cheers

[jeremylvln]

Hi @DomiIRL, I (somehow) broke a part of the Redis communication in my last PR. I will first look into repairing this and I will look after at your PR :)

Thanks a lot for this MR, means a lot to me!