Missing baseUrl when constructing callback signin url

[juanrgon]

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☕️ Reasoning

Fixing a bug with the signIn callback when logging in with credentials with redirect: false and returning a url in the response. Currently returning an error about the url failing to be constructed.

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• Tests
• Ready to be merged

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[manuganji]

I'm still seeing this TypeError.

TypeError: Failed to construct 'URL': Invalid base URL

When I debug this is what I see for values for this inputs.

baseUrl: /api/auth
data.url: http://localhost:3000/sign-in

The correct way to invoke is