Official mod updater Linux install instructions.

Remember to always make a backup of your save folder before doing any major changes to your server! Also, mods will still need to be loaded via the GUS.ini ActiveMods= or the command line as always. The only thing being added is the mods to download, install and/or update when server starts.

1) Create folder "ServerRoot"/Engine/Binaries/ThirdParty/SteamCMD/Linux
In my case "ServerRoot" is arkdedicated. If you are on host the Engine folder is located in the same folder as the ShooterGame folder.

2) Download SteamCMD tar ball file
https://steamcdn-a.akamaihd.net/client/installer/steamcmd_linux.tar.gz

3) Upload the tar ball to the SteamCMD/Linux folder that you just created

4) Extract steamcmd_linux.tar.gz in the Linux folder.

5) Add your mods listed in numerical order (it is important they are in numerical order) to the end of your Game.ini (located ShooterGame/Saved/Config/LinuxServer/) like so.

[ModInstaller]
ModIDS=Modid1
ModIDS=Modid2
ModIDS=Modid3
ModIDS=Modid4
ModIDS=Modid5
ModIDS=Modid6
etc

6) Add this to the end of your command line without the quotes "-automanagemods"

It will autorun every time the server is started and check for updates of the mods in the Game.ini as long as the mods are in numerical order and -automanagemods is at the end of the command line. There might still be bugs, but this one is at least supported by wildcard.

Side Note: On first start it will download all of the mods fresh.

For those with physical access or ssh to the servers steps 1-4 can be replaced with these four commands. From serverroot folder...same folder that the ShooterGame folder is located in.

mkdir Engine/Binaries/ThirdParty/SteamCMD/Linux
cd Engine/Binaires/ThirdParty/SteamCMD/Linux
wget https://steamcdn-a.akamaihd.net/client/installer/steamcmd_linux.tar.gz
tar -xvzf steamcmd_linux.tar.gz

Troubleshooting:
If a mod becomes corrupt
1) Stop the server and wait ~3mins
2) Delete the entire workshop folder located at
Engine/Binaries/ThirdParty/SteamCMD/Linux/steamapps/Workshop
3) Also Delete the everything in the Mods folder except 111111111 and TheCenter folders and file.
4) Start the server back up. It will redownload all of the mod content fresh.
This should be done regularly anyway.