How do I execute multiple postStart exec commands?

Referring to https://zero-to-jupyterhub.readthedocs.io/en/latest/user-environment.html#about-user-storage-and-adding-files-to-it

I would like to call the nbgitpuller multiple times for multiple repos.

This does not work, but how do I do it correctly?

singleuser:
  lifecycleHooks:
    postStart:
      exec:
        - command: ["gitpuller", "https://github.com/data-8/materials-fa17", "master", "materials-fa"]
        - command: ["gitpuller", "https://github.com/data-9/materials-blah", "master", "materials-blah"]

Hey @sqqqrly,
I have been looking for the same, its a kubernetes configuration, here is the way:

Thanks