Establish Workspace and Storage Controller pipeline variant with terraform for bucket provisioning

[achtsnits]

golden path for setup with provisioning pipeline using EOEPCA-demo cluster but with
a) AWS S3 as well as
b) CDSE OTC object storage
to demonstrate terraform integration as generic IaC solution

note: terraform integration is a prerequisite for Terrabyte platform (using Quobyte)

signoff: a separate pipeline definition using terraform for bucket provisioning is included in https://github.com/EOEPCA/workspace/tree/main/setup