Gitlab-shell install error

Trying to install 12.5 gitlab-ce manually on ubuntu/disco.
Get to the point where it says I need at least 10.2 gitlab-shell. So trying to install that manually.

sudo make check
bin/check
Failed to read config, exiting
make: *** [Makefile:35: check] Error 1

I have a config.yml in the gitlab-shell directory. What am I missing?
Thanks,