As a step toward switching the actual zips we put on wildfly.org/downloads to wildfly-maven-plugin builds, switch over the thin builds to it.

An advantage of this is that when the profile activated by using -Dexternal.channel.profile=GAV is used, the thin builds would use the specified channels as well, and as a result the testsuites that copy in the installation found in those builds and test against it would be testing against an installation that uses the deps from the specified channels.