Step: create-dir
-----------------------------------------------------------------------------

Create a directory in the target filesystem

Step keys:

* `create-dir` &mdash; REQUIRED; the full (starting from the new
  filesystem root) path name of the directory to create. It will work
  as a `mkdir -p` — Any intermediate directories that do not yet exist
  will be created.
* `perm` &mdash; OPTIONAL; the numeric (octal) representation of the
  directory's permissions. Defaults to 0755.
* `uid` &mdash; OPTIONAL; the numeric user ID of the directory's
  owner. Defaults to 0 (root).
* `gid` &mdash; OPTIONAL; the numeric user ID of the directory's
  group. Defaults to 0 (root).
