Add Devcontainer Support (#3777)

* add devcontainer files

* update postCreate

* add chmod for postCreate

* set CORES env variable to pass to build tool

* remove ssh functionality

* Move delete env file cmd to postStartCommand

* update how env file is done

* Update

- Move to older version of ubuntu for compatability
- Change vnc password to orca

.devcontainer/postCreate.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+# Update and upgrade all system packages
+apt update
+apt upgrade -y          
+
+echo "-----------------------------------------"	
+echo "Running BuildLinux.sh with update flag..."
+echo "-----------------------------------------"	
+./BuildLinux.sh -u
+
+echo "------------------------------"
+echo "Installing missing packages..."
+echo "------------------------------"
+apt install -y libgl1-mesa-dev m4 autoconf libtool