Override default task

[Danny O'Connor]

Hi there, 

I'm trying to override a biuldr default task and wondering what is the
easiest way.

So for example I want to override the 'upload' task for all projects.

I'm trying this in an Extension

after_define do |project|
     Rake::Task['upload'].clear_actions

     Rake::Task['upload'].enhance ... 
     

But it doesn't seem to be working, I still get the default upload
behaviour.

Thanks in advance,
Danny.