Remove references to the :soroban-dev variant from instructions for how to use soroban on the image, replacing them with :testing.
Why
The testing variant contains soroban functionality now. There's little reason for folks to use the soroban-dev variant. We might remove the soroban-dev variant, or we might not, but regardless most devs should use testing for testing, rather than soroban-dev now that soroban is available there.
What
Remove references to the
:soroban-devvariant from instructions for how to use soroban on the image, replacing them with:testing.Why
The testing variant contains soroban functionality now. There's little reason for folks to use the soroban-dev variant. We might remove the soroban-dev variant, or we might not, but regardless most devs should use testing for testing, rather than soroban-dev now that soroban is available there.