add restic to packges install

prep-grid-vm.sh

@@ -3,7 +3,7 @@
 update_system() {
     echo "Updating system and installing mandatory tools"
     apt-get update
-    apt-get install sudo nmon tmux tcpdump nano iputils-ping net-tools -y
+    apt-get install sudo nmon tmux restic tcpdump nano iputils-ping net-tools -y
 }
 
 install_docker() {