Add missing issuer to discord provider config

[jariz]

☕️ Reasoning

The discord provider currently doesn't work out of the box and needs the issuer to be manually added like so:

    Discord({
      issuer: "https://discord.com",
    }),

I believe this should be in the provider config by default as the provider does not work at all without adding this right now.

🧢 Checklist

• Documentation
• Tests
• Ready to be merged

🎫 Affected issues

Fixes: #12687

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[balazsorban44]

I believe this should be in the provider config by default as the provider does not work at all without adding this right now.

I just tested on https://next-auth-example.vercel.app/ and it works fine. Discord is configured here: https://github.com/nextauthjs/next-auth-example/blob/f2754cf5f37f100e126284702fbd1e6cc75e5afa/auth.ts#L68

and here:

next-auth/apps/proxy/api/[auth].ts

Line 46 in 887c28c

Discord,

I don' necessarily mind moving Discord to OIDC as I see there is a valid openid configuration at https://discord.com/.well-known/openid-configuration now, but it will require more changes than just adding an issuer.

Take the LinkedIn config for instance as a starting point, and feel free to update this PR: https://github.com/nextauthjs/next-auth/blob/main/packages/core/src/providers/linkedin.ts

[panva]

@balazsorban44 when the current config stops working is if users request the openid scope, at that point an ID Token is returned and validation fails, the expected issuer is absolutely required in that case.