Add it to your server
In your server's .ini file (servertest.ini by default), add these to the existing WorkshopItems= and Mods= lines, separated by a semicolon (;).
WorkshopItems=3824292323;3825006570
Mods=LooseEnds;LooseEndsHaleFeud
These lines include the mod it requires, as its Steam page declares it:
| Workshop item | Subscribers | Declared in |
|---|---|---|
| Loose Ends: The Hale Feud3825006570 | 28 | description footer |