How to Explicitly Set signinUrl and callbackUrl in NextAuth.js with a Custom OIDC Provider

[kosukekurimoto]

Hi there.
Is there a way to explicitly specify the signinUrl and callbackUrl when using a custom OIDC provider in auth.js?

// auth.js
import NextAuth from "next-auth"

export const { handlers, signIn, signOut, auth } = NextAuth({
    providers: [{
        id: "my-provider",
        name: "my-provider",
        type: "oidc",
        issuer: "XXX",
        clientId: process.env.AUTH_CLIENT_ID,
        clientSecret: process.env.AUTH_CLIENT_SECRET,
        authorization: "XXX",
        token: "XXX",
        userinfo: "XXX",
        jwks_endpoint: "XXX",
        profile(profile) {
            return {
                id: profile.sub,
                name: profile.sub,
                email: profile.sub
            }
        }
    }],
    pages: {
        signIn: "/login",
    },
    debug: true, // process.env.NODE_ENV === "development"
})

I'm using Cloud Run and Docker, and because the internal hostname of the container is automatically used, I need a way to explicitly set the URLs like below:

"signinUrl": "http://localhost:3000/api/auth/signin/cloudgate",
"callbackUrl": "http://localhost:3000/api/auth/callback/cloudgate"

[kosukekurimoto]

.env

AUTH_SECRET=XXX
AUTH_CLIENT_ID=XXX
AUTH_CLIENT_SECRET=XXX
AUTH_TRUST_HOST=true

version

"next-auth": "5.0.0-beta.28",