Update UNINSTALL-GLACIER.sh

UNINSTALL-GLACIER.sh

@@ -1,3 +1,8 @@
 #!/bin/sh
 
-echo "hi"
+# Require the script to be run as root
+if [[ $(/usr/bin/id -u) -ne 0 ]]; then
+    echo "[ X ] Please run Glacier uninstallation as root."
+    exit
+fi
+