Maybe changed updating message…?

[dyoder]

The first time you publish a new API, you get this:

 ❯ sky publish staging
Scanning AWS for current deploy.
No deployment detected. Preparing Panda Sky infrastructure.
Existing stack detected. Updating.

which is contradictory. Are we preparing or updating? We should either tailor the message based on whether we detected a Sky instance or just make it more specific. What's being updated? So we could do this something like this perhaps:

 ❯ sky publish staging
Scanning AWS for current deploy.
No deployment detected. Preparing Panda Sky infrastructure.
Adding S3 mixin.