Some plugins like the dashboard plugin
(http://mojo.codehaus.org/dashboard-maven-plugin/usage.html) requires that it is
not run in the same maven2 invocation as the main site generation.

This is not possible with hudson as far as I can tell. The nearest thing I can
think of is creating 3 freeform project

project 1: mvn clean site
project 2: dashboard:dashboard site:deploy
project 3: install

I am running install last since I want the site dashboard built, which is afaik
would not be with the install goal in project 1 (and with a failing unittest)
either that or running with the -fae option