Velocity Proxy Secrets via Secrets File

[Rocraften]

When setting up velocity and pumpkin and a limbo server, I found myself needing the ability to inject the secret from a file into the config, the limbo server had this already and so I just specified the file @forwarding.secret, but I don't believe pumpkin has the same feature.

Here's an example of what I did in the limbo servers config.

infoForwarding:
  type: MODERN
  secret: "@forwarding.secret"         # I'm able to specify the secret through a file (kind of like a .env)
  tokens:
  - "<BUNGEE_GUARD_TOKEN>"

[Rocraften]

I ended up testing this, it indeed is not a feature.

[Rocraften]

Pumpkin is meant to be secure and safe, this would most definitely bring it closer to that goal, it's also needed by a lot of setups, for example it makes it pretty easy to update the key on the fly, I'm currently using sym-links so all I have to do is change one file and the entire network is updated.