Supporting `imgadm publish` would be nice

[liuzhen]

man imgadm:

       Typically the local manifest and image file are created with
       "imgadm create ...". Note that "imgadm create" supports a
       "-p/--publish" option to publish directly in one step.
       Limitation: This does not yet support *authentication* that some
       IMGAPI image repositories require.

is it possible to turn auth off?