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Fix a couple of problems related to data used by the phases runners of `init` and `join`. 1) make `newInitData()` and `newJoinData()` return pointers. Methods of the data objects returned by these functions should be able to modify fields in the data objects - e.g. `func (d initData) Client()`. This allows us to store a state and not execute the same logic multiple times - e.g. obtaining a client. A side effect of this change is that the `new...` functions must return pointers, so that casting the data object in a phase, from `workflow.RunData` to a locally defined interface, works. 2) Make it possible to pass arguments from a parent command to a sub-phase with regards to data initialization.