CheckPendingMigrations.cs

if (!Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT").Equals("local", StringComparison.OrdinalIgnoreCase))
            {
                var serviceProvider = services.BuildServiceProvider();
                using (var ctx = serviceProvider.GetService<SampleContext>())
                {
                    var pendingMigrations = ctx.Database.GetPendingMigrations().ToList();
                    if (pendingMigrations.Any())
                    {
                        throw new Exception(
                            $@"Please contact the administrator. The following database migrations are pending:
                        {string.Join(Environment.NewLine, pendingMigrations)}
                    ");
                    }
                }
            }