Mailgun Provider needs option for EU server (domain is different)

[notflip]

Environment

System:
OS: macOS 14.6.1
CPU: (8) x64 Intel(R) Core(TM) i5-1038NG7 CPU @ 2.00GHz
Memory: 842.31 MB / 16.00 GB
Shell: 5.9 - /bin/zsh
Binaries:
Node: 20.10.0 - ~/.nvm/versions/node/v20.10.0/bin/node
Yarn: 1.22.22 - /usr/local/bin/yarn
npm: 10.2.3 - ~/.nvm/versions/node/v20.10.0/bin/npm
pnpm: 9.1.1 - /usr/local/bin/pnpm
Browsers:
Brave Browser: 129.1.70.119
Safari: 17.6
npmPackages:
@auth/supabase-adapter: ^1.4.2 => 1.4.2
next: 14.2.6 => 14.2.6
next-auth: 5.0.0-beta.22 => 5.0.0-beta.22
react: ^18 => 18.3.1

Reproduction URL

can't

Describe the issue

In the mailgun.ts file, the default Mailgun link is used, but there's 2 (one for europe as well).
We should make sure we can set it as a config

If we add a variable that can add .eu in front of .mailgun, we're good to go.

See line: const res = await fetch(https://api.eu.mailgun.net/v3/${domain}/messages`,`

export default function MailGun(config) {
    return {
        id: "mailgun",
        type: "email",
        name: "Mailgun",
        from: "Auth.js <[email protected]>",
        maxAge: 24 * 60 * 60,
        async sendVerificationRequest(params) {
            const { identifier: to, provider, url, theme } = params;
            const { host } = new URL(url);
            const domain = provider.from?.split("@").at(1);
            if (!domain)
                throw new Error("malformed Mailgun domain");
            const form = new FormData();
            form.append("from", `${provider.name} <${provider.from}>`);
            form.append("to", to);
            form.append("subject", `Sign in to ${host}`);
            form.append("html", html({ host, url, theme }));
            form.append("text", text({ host, url }));
            const res = await fetch(`https://api.eu.mailgun.net/v3/${domain}/messages`, {
                method: "POST",
                headers: {
                    Authorization: `Basic ${btoa(`api:${provider.apiKey}`)}`,
                },
                body: form,
            });
            if (!res.ok)
                throw new Error("Mailgun error: " + (await res.text()));
        },
        options: config,
    };
}

### How to reproduce

(Mailgun for EU specific, so you can't)

### Expected behavior

Have a config variable to choose the EU server, 

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Useful Resources

• How to create a Minimal, Complete, and Verifiable example
• Bug report: Framework
• Bug report: Provider
• Bug report: Adapter