Thank you @ich777 for your work on docker servers so far. If you're feeling up to the task, there is a game called Space Engineers that's been out for quite a few years now. As it stands, it is a Windows-only game with its own Windows-only server software that runs through steamCMD. Many have tried, and as of this post, I believe there are a couple of working dockers out there for the base SE server.
However, SE is a game like Minecraft; there exists a custom style of server called Torch, which has been challenged by many in getting a working Docker container up and running. Running a non-Torch SE server is like running Skyrim or Minecraft without mods (even OptiFine). Torch has a plugins system with numerous quality of life and functionality-improving features.
There have been a few functional Torch-based dockers in the past, and about a year ago I tried all of them to no success - they had all broken with time.
If you could get a linux or unraid-friendly docker for SE working, especially a Torch server, I know it would be greatly appreciated by a community of players. Both SE and the Torch guys have their own Discord servers with linux-specific sections that probably have lots of people eager to help.