/// <summary>
/// Creates an <see cref="IConfiguration"/> instance and attaches to an `appsettings.json` file, also adding an `appsettings.{environment}.json` on top of it, if available, based on current AZURE_FUNCTIONS_ENVIRONMENT environment variable.
/// </summary>
/// <param name="builder">An instance of <see cref="IFunctionsConfigurationBuilder"/>.</param>
/// <param name="reloadOnChange">Whether the configuration should be reloaded on file change.</param>
/// <returns>The <see cref="IFunctionsConfigurationBuilder"/>.</returns>
public static IFunctionsConfigurationBuilder UseAppSettings(this IFunctionsConfigurationBuilder builder, bool reloadOnChange = false)
{
var context = builder.GetContext();
builder.ConfigurationBuilder
.AddJsonFile(Path.Combine(context.ApplicationRootPath, "appsettings.json"), optional: true, reloadOnChange: reloadOnChange)
.AddJsonFile(Path.Combine(context.ApplicationRootPath, $"appsettings.{builder.GetCurrentEnvironmentName()}.json"), optional: true, reloadOnChange: reloadOnChange)
.AddEnvironmentVariables();
return(builder);
}