These are the files for the Valheim Dedicated server video. Simply clone these, do your edits, make sure the valheim.sh file is executable and you are ready to go.
https://developer.valvesoftware.com/wiki/SteamCMD#Anonymous
mkdir ~/Valheim
steamcmd +login anonymous +force_install_dir /home/<username>/Valheim +app_update 896660 validate +exit