diener arguments can be more flexible

[joao-paulo-parity]

diener offers a flexible --target [arbitrary] argument which we can use instead of the fixed --substrate, --polkadot, etc.

https://github.com/bkchr/diener/blob/69ab0f76fb851968af8e493061cca84a2f3b1c5b/src/patch.rs#L53

[joao-paulo-parity]

This is already done