Implements client, clientscope, group, realm, role file-based storage. Initially forked from Keycloak's own experimental version.
Intended to be used in read-only filesystems, for example mounted K8s-configmaps (but can also be used to interactively create the configuration by using the admin console)
To use this, you most likely have to implement your own DatastoreProvider and mix it with a different implementation to store users, sessions etc.