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

multinode-demo/common.sh

@@ -70,7 +70,12 @@ source "$SOLANA_ROOT"/scripts/configure-metrics.sh
 SOLANA_RSYNC_CONFIG_DIR=$SOLANA_ROOT/config
 
 # Configuration that remains local
-SOLANA_CONFIG_DIR=$SOLANA_ROOT/config-local
+SECONDARY_DISK_MOUNT_POINT=/mnt/extra-disk
+if [[ -d $SECONDARY_DISK_MOUNT_POINT ]]; then
+  SOLANA_CONFIG_DIR=$SECONDARY_DISK_MOUNT_POINT/config-local
+else
+  SOLANA_CONFIG_DIR=$SOLANA_ROOT/config-local
+fi
 
 default_arg() {
   declare name=$1