Path issue when no volume is mounted

[Dids]

Running without mounting a volume (eg. docker run --name rust-server didstopia/rust-server) doesn't work, most likely due to the old path issue. Should be an easy fix though.

Fallback handler could not load library /steamcmd/rust/RustDedicated_Data/Mono/x86_64/libsteam_api64.so
[S_API FAIL] SteamAPI_Init() failed; SteamAPI_IsSteamRunning() failed.
dlopen failed trying to load:
steamclient.so
with error:
steamclient.so: cannot open shared object file: No such file or directory
[S_API FAIL] SteamAPI_Init() failed; unable to locate a running instance of Steam, or a local steamclient.so.
Fallback handler could not load library /steamcmd/rust/RustDedicated_Data/Mono/x86_64/libsteam_api64.so
Couldn't initialize Steam Server (0)
eac_server.so [x64] :: OnLoad()
Server startup complete
Setting up 1 worker threads for Enlighten.
  Thread -> id: 7f1287600700 -> priority: 1 
EasyAntiCheat Shutting Down
[Raknet] Server Shutting Down (Shutting Down)
Unhandled Exception: System.NullReferenceException: 
  at (wrapper managed-to-native) UnityEngine.AssetBundle:Unload (bool)
  at FileSystem_AssetBundles.Finalize () [0x00000] in <filename unknown>:0 

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.