A little tool to compile GodMode9 or SafeMode9 and put it in a release like package. firmtool is needed. To use the tool extract the contents of GodMode9_compiling_tool.zip in a folder named like the commit youre using with the sourcecode inside.
The Zip made at the end has these things inside:
gm9 ntrboot GodMode9.firm HelloScript.gm9 readme.md
so as you see it is just like a release package.