Use artifactClassifier when uploading to an Artifact repository 

First let me thank you for this plugin, it is very helpful!

It may not be an issue perhaps more a question but I could not find the answer so I apologize in advance if I am the problem :)

Is it be possible to add a classifier on our _jar_?

Example:
`ThisBuild / artifactClassifier := Some("feature-branch-name")` so we end up with `my-app_2.12-1.0.0-feature-branch-name`

Thank you