add steamcmd install script

add a steamcmd install script for people to use.

scripts/steamcmd_installer.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+# steamcmd Base Installation Script
+#
+# Server Files: /mnt/server
+# Image to install with is 'ubuntu:18.04'
+apt -y update
+apt -y --no-install-recommends install curl lib32gcc1 ca-certificates
+
+## just in case someone removed the defaults.
+if [ "${STEAM_USER}" == "" ]; then
+    STEAM_USER=anonymous
+    STEAM_PASS=""
+    STEAM_AUTH=""
+fi
+
+## download and install steamcmd
+cd /tmp
+mkdir -p /mnt/server/steamcmd
+curl -sSL -o steamcmd.tar.gz http://media.steampowered.com/installer/steamcmd_linux.tar.gz
+tar -xzvf steamcmd.tar.gz -C /mnt/server/steamcmd
+cd /mnt/server/steamcmd
+
+# SteamCMD fails otherwise for some reason, even running as root.
+# This is changed at the end of the install process anyways.
+chown -R root:root /mnt
+export HOME=/mnt/server
+
+## install game using steamcmd
+./steamcmd.sh +login ${STEAM_USER} ${STEAM_PASS} ${STEAM_AUTH} +force_install_dir /mnt/server +app_update ${SRCDS_APPID} ${EXTRA_FLAGS} +quit ## other flags may be needed depending on install.
+
+## set up 32 bit libraries
+mkdir -p /mnt/server/.steam/sdk32
+cp -v linux32/steamclient.so ../.steam/sdk32/steamclient.so
+
+## set up 64 bit libraries
+mkdir -p /mnt/server/.steam/sdk64
+cp -v linux64/steamclient.so ../.steam/sdk64/steamclient.so