Add regular user spark and clone-sparkos.sh script, default to non-root login

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

rootfs/etc/group

@@ -1 +1,3 @@
 root:x:0:
+spark:x:1000:
+sudo:x:27:spark

rootfs/etc/passwd

@@ -1 +1,2 @@
 root:x:0:0:root:/root:/bin/sh
+spark:x:1000:1000:SparkOS User:/home/spark:/bin/sh

rootfs/etc/profile

@@ -2,9 +2,15 @@
 
 export PATH=/bin:/sbin:/usr/bin:/usr/sbin
 export PS1='SparkOS:\w\$ '
-export HOME=/root
 export TERM=linux
 
+# Set HOME based on user
+if [ "$(id -u)" = "0" ]; then
+    export HOME=/root
+else
+    export HOME=/home/$(whoami)
+fi
+
 # Welcome message
 echo "Welcome to SparkOS!"
 echo "Type 'help' for available commands"

rootfs/etc/sudoers

@@ -0,0 +1,15 @@
+# SparkOS Sudoers Configuration
+# Allow spark user to run any command without password
+
+# Default settings
+Defaults env_reset
+Defaults secure_path="/bin:/sbin:/usr/bin:/usr/sbin"
+
+# Root can run anything
+root ALL=(ALL:ALL) ALL
+
+# Spark user can run anything without password
+spark ALL=(ALL:ALL) NOPASSWD: ALL
+
+# Include sudoers.d directory
+@includedir /etc/sudoers.d