allow to pull superschema with hive:fetch based on schema checks

[comatory]

This is a suggestion to augment hive:fetch command, or possibly introduce an alternative way to pull in superschema which contains changes to subschema which has not been published yet. It is a little bit similar to this but my use-case is not for local development but for CI automation.

In some cases, I'd like to construct superschema on a PR branch, take the superschema and run it through Relay compiler in our front-end codebase to be absolutely sure we won't break anything. (FYI we had issue where we approved changes to subschema which renamed enum members, it seemed to be ok but then it failed during runtime because of FE usage).

Allowing to run hive:fetch with commit SHA that maps to a version in schema checks would solve my problem.

[kamilkisiela]

Maybe something like this?
#2437

[comatory]

Maybe something like this? #2437

@kamilkisiela yep that sounds like something that would work for us. You can mark this one as duplicate / related and close it. Thanks!