This guide has now moved to here https://github.com/OnniSaarni/SPT-Fika-Docker-Guide
This gist can still be used for discussion if you'd like.
Feel free to make an issue or a pull request if you'd like to contribute by expanding some sections or just otherwise contributing something to the guide.
Scripts and automated tools are welcome too if you wish to have them in the repo.
So when starting the game you set the launcher URL to your vps ip and then you're connected to the server. Now if you want to host a raid you either port forward 25565 or use a VPN like radmin and connect to your friend trough that. You also have to change your ip in the F12 Fika setting force ip to the raid hosts ip. I would recommend using the firewall fixer tool in the discord if you already haven't.
The server on the VPS handles only your hideout and stash stuff. As long as you start your game trough the launcher with the VPS ip as the URL you should be connected to the VPS server. The raids on the other hand are handled by your pc.
This is not a problem with this guide or your VPS setup if you can start the game with the url as the vps ip. For further support please go to the discord. This is a common problem among players and you'll find a solution by just doing some searching or making a support post.