Draft: Customize backend instances for restricted template creation and IOC instance generation

Requirements:

• test should use production locations since it is a non-functional replica
• • test should not be able to generate instances
• demo should use the current locations (under ccce/dev/)
• the production server should use iocs/factory for instances and ccce/ioc-types/* for templates and configs

Remaining tasks:

• add config for PROD server
• create a group access token for PROD: group https://gitlab.esss.lu.se/iocs, 'api' scope
• create a group access token for test: group https://gitlab.esss.lu.se/iocs, 'read_api' scope