Add onprem testbed configuration
I saw the conversation in https://gitlab.com/groups/gitlab-com/gl-infra/-/epics/60#note_174049482 and wanted to try to help setting up the configuration for the onprem testbed.
This is my first time working in this project so any feedback is very welcome! @at.ramya @sliaquat @mlapierre
Edited by George Koltsov