CI for ModelDBRepository ?

[alexsavulescu]

Since there is no global CI option available, it would be possible to introduce a CI for ModelDBRepository as follows:

• create a driver-CI repository that contains a reusable workflow
• add CIs for all ModelDBRepository NEURON models that use the driver-CI reusable workflow (with @master)
  • all PR testing can then be driven by updates to driver-CI@master We could, for example, test last two major NEURON releases + nightly