Support adding a new component to an existing published repo

[segevfiner]

Detailed Description

You currently cannot add a new component to an existing published repo. aptly publish snapshot will fail because the repo already exists and aptly publish switch will not allow to switch a non-existent component

Context

This is useful when you figure out later on that you need another component for an existing repo.

Your Environment

Aptly 1.2.0

[emopinata]

This would definitely be a highly desired feature, as I recently just had to drop and republish some repos because I wanted to add new components.

[arthurzenika]

We're having this problem too. Are there any other solution than the work around suggested by @iammanbeard ?

[r0b3r4]

Please...