Backend Docker/keycloak

containers... the present docker-compose [here ](https://github.com/earthcube/jsonld_forms/tree/master/docker)needs to be changed to use treafik.

* minio
* traefik (what we use)
* keycloak (hosted at NCSA, or a docker

Notes on [how the UI and minio](https://github.com/earthcube/jsonld_forms/blob/master/docker/README.md#setting-up-minio-for-multi-users) should interact:

Minio docker needs to be configured/populated with the policy to restrict users to a 'home' directory

keycloak, because that will handle the registering of users, I believe. Otherwise we need to create a quick api to create users. We can reuse keycloak as a user login for jena fuseki in the shiro.conf (I think)

trafik examples in geodes:
https://github.com/earthcube/geodex

Postman tests for the policies are in:
docker/MinioTests.postman_collection.json