How do I tell sbt to publish a zip instead of a jar?

How do I tell sbt to publish a zip instead of a jar?

SBT docs describe how to publish to a maven repo:
http://www.scala-sbt.org/release/docs/Detailed-Topics/Publishing
I want to publish just the contents of the src/main/resources folder and I
want to publish a zip instead of a jar.
Can I do this without adding an sbt plugin?