Dynamically create Role and Permission.

import { betterAuth } from "better-auth"
import { admin as adminPlugin } from "better-auth/plugins"
import { ac, admin, user } from "@/auth/permissions"
 
export const auth = betterAuth({
    plugins: [
        adminPlugin({
            ac,
            roles: {
                admin,
                user,
                myCustomRole
            }
        }),
    ],
});