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Setting `unreferenced` from environment var
Is there a way to use the option --unreferenced=reject without using cargo-insta? I'm in a situation where I want to use insta but not rely on cargo-insta existing when running in CI. As far as I can tell, there is no way to do this with an environment var.
Looks like the other option is using .insta.yaml (#759), but I would prefer an env var option. Is this a possibility?
I don't think this exists at the moment. would be very willing to merge a change to add it — we have the equivalent for many other options...