Just a question

It seems like I can't comment on a line of the code without a commit being involved, so I forked and edited the file.
 
I just wanted to know where the start file is used from, since the Dockerfile does not ADD it to the container, and I don't see any references to it. 

What am I missing? 

Sorry for this awkward way of posting a question, but I didn't find another way.

Thanks in advance!