First, download the game using steamcmd (you can use the docker image)
@sSteamCmdForcePlatformType windows
force_install_dir /data/data-windows
login youruser
app_update 215350
Then you need to copy the DLLs from the windows version of steamcmd to the System folder of Killing Floor
cp steamcmd/steamclient.dll kfserver/System
cp steamcmd/tier0_s.dll kfserver/System
cp steamcmd/vstdlib_s.dll kfserver/System
Create a podman user using the provided script create-podman.sh podman-kf1
Then login to it using
sudo machinectl shell podman-kf1@ /bin/bash
Install and modify the kf1.container to .config/containers/systemd
Refresh services
systemctl --user daemon-reload
Enable auto updates
systemctl --user enable podman-auto-update.timer
Start the server
systemctl --user start kf1