Improvement: Profile: repository with credentials into profile.yml

Hi there,

It would be very nice to be able to add a repository with credentials into profile.yml when we do a profile.
For example now it is only possible to write:
`- http://myartifactory/artifactory/plugins-release-local/`

I would be like something like:
`- http://myartifactory/artifactory/plugins-release-local/
-user: myuser
-password: mypassword`

Thank you.

Sébastien

Start by locating the profile.yml parsing and repository configuration entry points in Grails. Determine how repository credentials should be represented and validated, then confirm that profiling accepts the credential-bearing repository and preserves existing repository-only configuration.

Written by the indexing model from the issue text.