Running DNU recovery on VSO build

I am trying to get DNX projects generated on VSO server.

First you need to install DNX. To do this, I have the following permissions script:

DNX-upgrade.ps1:

dnvm upgrade -r clr -arch x86 -v 1.0.0-beta6

      

        
        
        
      

    

It successfully sets and updates the PATH:

Adding C: \ Users \ buildguest.dnx \ runtimes \ dnx-clr-win-x86.1.0.0-beta6 \ bin for the PATH process
Adding C: \ Users \ buildguest.dnx \ runtimes \ dnx-clr-win-x86. 1.0.0-beta6 \ bin for user PATH

Then I need to restore solution packages using this script:

DNU-restore.ps1:

dnu restore

      

        
        
        
      

    

But I am getting the following error when executing dnu-restore.ps1:

[error] dnu: The term 'dnu' is not recognized as the name of a cmdlet, function, script file, or workable program. Check the [Error] spelling of the name, or if the path was included, make sure the path is correct and try again.
[Error] When C: \ a \ 8ac4a4f6 \ Root \ MyProject \ Development \ dnu-restore.ps1: 1 char: 1
[error] + dnu restore
[error] + ~~~
[error] + CategoryInfo: ObjectNotFound: (dnu : String) [], CommandNotFoundException
[error] + FullyQualifiedErrorId: CommandNotFoundException

Build tasks:

Why is this happening? Should dnu

I do it? Is there a better way to restore DNX project packages?