I's using the ich777/steamcmd:insurgencysandstorm container. When setting the map, maxplayer and password in the 'GAME_PARAMS' command line box. The Farmhouse map is loaded by default with default maxplayer of 32 and no server password is applied.
In the file opt/scripts/start-server.sh inside the container, the last line has this:
${SERVER_DIR}/Insurgency/Binaries/Linux/InsurgencyServer-Linux-Shipping -Port=${GAME_PORT} -QueryPort=${QUERY_PORT} -log -hostname=${SERVER_NAME} ${GAME_PARAMS}
If the ${GAME_PARAMS} is moved to before -Port=${GAME_PORT}, the GAME_PARAMS: in the container setup works and the server uses the proper map. maxplayers and server password
${SERVER_DIR}/Insurgency/Binaries/Linux/InsurgencyServer-Linux-Shipping ${GAME_PARAMS} -Port=${GAME_PORT} -QueryPort=${QUERY_PORT} -log -hostname=${SERVER_NAME}