adding kube-prometheus as a submodule

[hakkyou]

Hello!
I am trying to add kube-prometheus as git submodule of my manifests repo and when I try
docker run --rm -v $(pwd):$(pwd) --workdir $(pwd) quay.io/coreos/jsonnet-ci jb update
from submodule dir, I get

fatal: not a git repository: /Users/[username]/Documents/[myteamname]/devops/k8s/monitoring/kube-prometheus/../../../.git/modules/k8s/monitoring/kube-prometheus
GET https://github.com/etcd-io/etcd/archive/.tar.gz 404

and then proceeds to fetch temporary repository folders for all the dependencies, and after that if I invoke jb update once again it proceeds to fetch temporary repository folders again.

Can I have jb update the way it goes when I use kube-prometheus repo standalone - just geting archives with deps from github?