Reckoner diff/template could provide a list of api-versions to helm template command

[lucasreed]

It shouldn't be too difficult to build a list of api-versions from the cluster currently connected (kubectl api-versions) and construct a helm template command that includes each of those using the following syntax:

--api-versions v1 \
--api-versions apps/v1 \
...

This would be a big value add over the base helm template command.

Another caveat to keep in mind is that reckoner template can also be run when not connected to a cluster so we need to decide how to handle that. Do we assume a certain version of kubernetes is installed and use it's default versions?