bin/rails: WASI args support

[palkan]

Currently, we have to copy-paste the Rails CLI code to replace ARGV calls with a custom args variable: https://github.com/palkan/tutorialkit-rb-playground/blob/f429ea727335a2db9c8500828fcf90c32ac79ad0/src/templates/default/bin/rails#L12

In theory, it should be possible to pass command args to the Wasm executable through the WASI params: https://github.com/palkan/tutorialkit-rb-playground/blob/f429ea727335a2db9c8500828fcf90c32ac79ad0/src/templates/default/lib/rails.js#L25

For some yet unknown reason that doesn't work. Let's figure this out (could it be a ruby,wasm issue?).