Add support for additional disks for config-local (#5030)

* Add support for additional disks for config-local

* Restore wrongly deleted lines

* Shellcheck

* add args in the right place dummy

* Fix nits

* typo

* var naming cleanup

* Add stub function for remaining cloud providers

net/scripts/mount-additional-disk.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+set -x
+
+mount_point=/mnt/extra-disk
+disk=sdb
+if ! lsblk | grep -q ${disk} ; then
+  echo "${disk} does not exist"
+else
+  if mount | grep -q ${disk} ; then
+    echo "${disk} is already mounted"
+  else
+    sudo mkfs.ext4 -F /dev/"$disk"
+    sudo mkdir -p "$mount_point"
+    sudo mount /dev/"$disk" "$mount_point"
+    sudo chmod a+w "$mount_point"
+    if ! mount | grep -q ${mount_point} ; then
+      echo "${disk} failed to mount!"
+      exit 1
+    fi
+  fi
+fi