Add template support - Rails

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Summary

In the first iteration (#507268 (closed)): Rails gets the default template, renders the template, applies the rendered template. In this issue: let the user (optionally) specify what template to use and get that template instead of the default one.

Proposal

To be added

Related documentation

The documentation was already written and removed in !181755 (6b9d1985)

You are welcome to re-add the related parts or start from scratch.