We don't currently have any conventions for strongly typed inputs in
Python. I expect that Python functions will just use struct_to_dict to
read their inputs as unstructured data. It's useful to demonstrate
having an input schema in the template, though. Places like
https://marketplace.upbound.io use this CRD schema to document a
function's input.
Signed-off-by: Nic Cope <nicc@rk0n.org>