With the Zend Developer Cloud you can now use Git over SSH to handle source control.  One reason why you might want to do this is because it easily supports public key authentication like you are using with SFTP.  

First, go to your application in the DevCloud GUI and click on "git"

 
Copy the SSH Git repository URL. 

If you are on the CLI you can then clone your project with the following command.

$ git clone ssh://mytestcontainer@mytestcontainer.my.phpcloud.com/gitprojects/container-root.git
Cloning into container-root...
remote: Counting objects: 4, done.
remote: Compressing objects: 100% (3/3), done.
remote: Total 4 (delta 0), reused 0 (delta 0)
Receiving objects: 100% (4/4), 1.24 KiB, done.