Unspoken requirement the repo must be cloned?

[bkuhl]

I downloaded the zip of this repo and when I make the root of this repo it builds a number of containers and then I run into:

...
Successfully built f1167fb6299f
Successfully tagged migration-tools-master:hCTcCXT
Sending build context to Docker daemon  495.1MB
Step 1/2 : FROM migration-tools-master:hCTcCXT
 ---> f1167fb6299f
Step 2/2 : COPY . /go/src/github.com/rancher/migration-tools/
 ---> d72deac36b1e
Successfully built d72deac36b1e
Successfully tagged migration-tools-master:hCTcCXT
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
FATA[0252] exit status 128
Makefile:11: recipe for target 'ci' failed
make: *** [ci] Error 1

Is it an unspoken requirement that this repo be cloned in order to use it? It'd be ideal if this tool was already in a docker container we could execute and mount our config into.