add steam Proton Support

steamcmd/entrypoint.sh

@@ -33,10 +33,14 @@ export TZ
 INTERNAL_IP=$(ip route get 1 | awk '{print $(NF-2);exit}')
 export INTERNAL_IP
 
+# Set environment for Steam Proton
+mkdir -p /home/container/.steam/steam/steamapps/compatdata/${SRCDS_APPID}
+export STEAM_COMPAT_CLIENT_INSTALL_PATH="/home/container/.steam/steam"
+export STEAM_COMPAT_DATA_PATH="/home/container/.steam/steam/steamapps/compatdata/${SRCDS_APPID}"
+
 # Switch to the container's working directory
 cd /home/container || exit 1
 
-
 ## just in case someone removed the defaults.
 if [ "${STEAM_USER}" == "" ]; then
     echo -e "steam user is not set.\n"