IStartupTask outside WebhostBuilder

DbMigrationTask.cs

public class DbMigrationTask<TDbContext> : IStartupTask
    where TDbContext : DbContext
{
    private readonly TDbContext _dbContext;

    public DbMigrationTask(TDbContext dbContext)
    {
        _dbContext = dbContext;
    }

    public async Task ExecuteAsync(CancellationToken cancellationToken = default)
    {
        await _dbContext.Database.MigrateAsync();
    }
}

ServiceCollectionExtensions.cs

public static class ServiceCollectionExtensions
{
    public static IServiceCollection AddStartupTask<TStartupTask>(this IServiceCollection services)
        where TStartupTask : class, IStartupTask =>
        services
            .AddTransient<TStartupTask>()
            .AddTransient<IStartupTask, ScopedStartupTask<TStartupTask>>();

    private class ScopedStartupTask<TStartupTask> : IStartupTask
        where TStartupTask : class, IStartupTask
    {
        private readonly IServiceProvider _services;
            
        public ScopedStartupTask(IServiceScope scope)
        {
            _services = scope.ServiceProvider;
        }

        public Task ExecuteAsync(CancellationToken cancellationToken = default)
            => _services.GetRequiredService<TStartupTask>().ExecuteAsync(cancellationToken);
    }
}

WebHostExtensions.cs

public static class WebHostExtensions
{
    public static async Task RunWithTasksAsync(this IWebHost webHost, CancellationToken cancellationToken = default)
    {
        foreach (var task in webHost.Services.GetServices<IStartupTask>())
        {
            await task.ExecuteAsync(cancellationToken);
        }

        await webHost.RunAsync(cancellationToken);
    }
}