How to add Entity Framework Database migrations on startup

ef-auto-migrate.cs

using System;
using System.Linq;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

// Other classes can found at https://docs.microsoft.com/en-us/ef/core/get-started/overview/first-app
// Requires generation of migrations using ef tools

// Standalone, this is a bad idea
// Use this carefully, see https://docs.microsoft.com/en-us/ef/core/managing-schemas/migrations/applying?tabs=dotnet-core-cli#apply-migrations-at-runtime

namespace EntityFrameworkTraining
{

    public static class MigrationManager
    {
        public static IHost MigrateDatabases(this IHost host)
        {
            using(var scope = host.Services.CreateScope())
            {
                using(var ctx = scope.ServiceProvider.GetRequiredService<BloggingContext>())
                {
                    ctx.Database.Migrate();
                }
            }
            return host;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {


            var host = new HostBuilder()
                .ConfigureServices(services => {
                    services.AddDbContext<BloggingContext>();
                })
                .Build()
                .MigrateDatabases();


            using(var db = new BloggingContext())
            {

                Console.WriteLine("Inserting a new blog");
                db.Add(new Blog { Url = "http://blogs.msdn.com/adonet" });
                db.SaveChanges();

                // Read
                Console.WriteLine("Querying for a blog");
                var blog = db.Blogs
                    .OrderBy(b => b.BlogId)
                    .First();

                // Update
                Console.WriteLine("Updating the blog and adding a post");
                blog.Url = "https://devblogs.microsoft.com/dotnet";
                blog.Posts.Add(
                    new Post
                    {
                        Title = "Hello World",
                        Content = "I wrote an app using EF Core!"
                    });
                db.SaveChanges();


                // // Delete
                Console.WriteLine("Delete the blog");
                db.Remove(blog);
                db.SaveChanges();


                
            }
        }
    }
}