seeding admin in app asp.net core

namespace Chushka.Web.App
{
    using Chushka.Models;
    using Microsoft.AspNetCore.Identity;
    using Microsoft.EntityFrameworkCore;
    using Microsoft.Extensions.DependencyInjection;
    using System;
    using System.Threading.Tasks;
    using Microsoft.AspNetCore;
    using Microsoft.AspNetCore.Hosting;

    public class Program
    {
        public static void Main(string[] args)
        {
            var host = CreateWebHostBuilder(args).Build();

            using (var scope = host.Services.CreateScope())
            {
                var serverProvider = scope.ServiceProvider;

                SeedUserRoles(serverProvider).GetAwaiter().GetResult();
            }

            host.Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>();

        private static async Task SeedUserRoles(IServiceProvider serverProvider)
        {
            //initializing custom roles
            var roleManager = serverProvider.GetRequiredService<RoleManager<IdentityRole>>();
            var userManager = serverProvider.GetRequiredService<UserManager<AppUser>>();

            string[] roleNames = { "Admin", "Manager" };

            foreach (var roleName in roleNames)
            {
                var roleExist = await roleManager.RoleExistsAsync(roleName);

                if (!roleExist)
                {
                    //create the roles and seed them to the database: Question 1
                    await roleManager.CreateAsync(new IdentityRole(roleName));
                }
            }

            var users = await userManager.Users.ToListAsync();

            //
            // 1. Regex pattern for admins instead of specific name.
            // 2. Controller for roles.
            //
            AppUser user = await userManager.FindByEmailAsync("[email protected]");

            if (user == null)
            {
                user = new AppUser
                {
                    UserName = "[email protected]",
                    Email = "[email protected]",
                    Fullname = "admin"
                };
                await userManager.CreateAsync(user, "[email protected]");
                await userManager.AddToRoleAsync(user, "Admin");
                await userManager.AddPasswordAsync(user, "admin");
            }
        }
    }
}