Thanks Isman!
its clear now, I found some info in your docs at https://www.gluu.org/docs/de/operation/vault/. A link in the README would be nice.
Also, I found that the run_all.sh scrip as it is does not run on docker Mac due to a number of problems around networking, but also unsupported commands.
I got to run it after all, nice exercise, but will switch to CentOS now, to keep it as vanilla as possible during evaluation.