put virtualenv activation during build in comment. That means that for the moment the build machine must be provisionned beforehand, or ansible must be available globally
name = Corpus Client
description = Corpus de la Parole Client
core = 7.x
php = 5.6
; stylesheets
stylesheets[all][] = app-client/assets/vendor.css
stylesheets[all][] = app-client/assets/app-client.css