Compile garden init with required additional source file
Compile garden init with required additional source file

[finishes #160518002](https://www.pivotaltracker.com/story/show/160518002)

cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release