Runs entered Apache Ant tasks as a build file with only one target, untill you write code into the "Extended script
source", but the target created from this code will always be the default target of the created build file.
The script will run with WORKSPACE as the current directory. Build will be considered as failure if any Ant task
fails. You can use Ant-Contrib tasks
(if it is enabled in global configuration). You need to use namespace "antcontrib" (example: "<antcontrib:if>").