title: ExecutionContext in Azure Function IWebJobsStartup implementation
body: <p>How to get access to the ExecutionContext.FunctionAppDirectory in Functions Startup class so I can setup my Configuration correct. Please see the following Startup code:</p>
  
  <pre><code>[assembly: WebJobsStartup(typeof(FuncStartup))]
  namespace Function.Test
  {
      public class FuncStartup : IWebJobsStartup
      {
          public void Configure(IWebJobsBuilder builder)
          {
              var config = new ConfigurationBuilder()
                 .SetBasePath(“”/* How to get the Context here. I cann’t DI it 
                             as it requires default constructor*/)
                 .AddJsonFile(“local.settings.json”, true, reloadOnChange: true)
                 .AddEnvironmentVariables()
                 .Build();
  
          }
      }
   }
  </code></pre>