It seems that you should be able to use [conf] in the artifacts pattern, but I did see this, http://old.nabble.com/-conf--in-artifactspattern-td32476460.html, so it might not work.
I worked around this by using an extended property and using that in the path. I basically use IVY to share binaries between upstream and downstream build jobs. The build is being migrated to Jenkins, and I want to keep a central filesystem repository for build artifacts. The price I pay is a proliferation of ivy.xml files. This is Microsoft .NET build, so using something like Maven would be like the proverbial square peg jammed into a round hole. We are using MSBuild for the build and Ant + Ivy for the artifact management. agreen
