This is a test repository for use with a cloud-centric Hiera. Hiera exposes a small web service which provides configuration data to downstream applications so they can take advantage of the elegant "source of truth". For example, Terraform could use Hiera as an external data source by querying the web service and turning the (YAML or JSON) output into local scope variables for use in TF plans.
It is slightly different from Puppet-based hiera setups because Puppet always has the context of the node for which it's doing a lookup. The node has facts associated with it, which Hiera uses for interpolating hierarchy variables to find the right file for looking up data. There isn't an implicit context for cloud lookups, though; in this case we are using the 'workspace' directory as an enumeration of contexts which exist; each file in that directory contains the set of variables and values for hierarchy interpolation.