public static async Task <string> updateStack([ActivityTrigger] UpdateBaseImageRequest request, ILogger log)
        {
            SecretsUtils _secretsUtils = new SecretsUtils();
            await _secretsUtils.GetSecrets();

            GitHubUtils _githubUtils = new GitHubUtils(_secretsUtils._gitToken);

            String timeStamp = DateTime.Now.ToString("yyyyMMddHHmmss");
            String random    = new Random().Next(0, 9999).ToString();
            String prname    = String.Format("blimp{0}{1}", timeStamp, random);
            String parent    = String.Format("D:\\local\\Temp\\blimp{0}{1}", timeStamp, random);

            String repoUrl  = String.Format("https://github.com/Azure-App-Service/{0}-template.git", request.stack);
            String repoName = String.Format("{0}-template", request.stack);

            _githubUtils.CreateDir(parent);

            String localTemplateRepoPath = String.Format("{0}\\{1}", parent, repoName);

            _githubUtils.Clone(repoUrl, localTemplateRepoPath, "dev");
            _githubUtils.Checkout(localTemplateRepoPath, prname);

            // edit the configs
            await updateConfig(String.Format("{0}\\{1}", localTemplateRepoPath, "blessedImageConfig-dev.json"), request.NewBaseImage);
            await updateConfig(String.Format("{0}\\{1}", localTemplateRepoPath, "blessedImageConfig-master.json"), request.NewBaseImage);
            await updateConfig(String.Format("{0}\\{1}", localTemplateRepoPath, "blessedImageConfig-temp.json"), request.NewBaseImage);
            await updateConfig(String.Format("{0}\\{1}", localTemplateRepoPath, "blessedImageConfig-save.json"), request.NewBaseImage);

            _githubUtils.Stage(localTemplateRepoPath, "*");
            _githubUtils.CommitAndPush(localTemplateRepoPath, prname, String.Format("[blimp] new base image {0}", request.NewBaseImage));
            String pullRequestURL = String.Format("https://api.github.com/repos/{0}/{1}-template/pulls?access_token={2}", "azure-app-service", request.stack, _secretsUtils._gitToken);
            String body           =
                "{ " +
                "\"title\": " + JsonConvert.SerializeObject("[blimp] Update Base Image") + ", " +
                "\"body\": " + JsonConvert.SerializeObject("[blimp] auto generated Update Base Image") + ", " +
                "\"head\": " + JsonConvert.SerializeObject("azure-app-service:" + prname) + ", " +
                "\"base\": " + JsonConvert.SerializeObject("dev") +
                "}";
            HttpClient httpClient = new HttpClient();

            httpClient.DefaultRequestHeaders.UserAgent.ParseAdd("patricklee2");
            HttpResponseMessage response = null;

            response = await httpClient.PostAsync(pullRequestURL, new StringContent(body)); // fails on empty commits

            String result = await response.Content.ReadAsStringAsync();

            System.Console.WriteLine(response.ToString());
            System.Console.WriteLine(result);
            //if (response.StatusCode == HttpStatusCode.UnprocessableEntity)
            //{
            //    System.Console.WriteLine("Unable to make PR due to no differnce");
            //}

            _githubUtils.gitDispose(localTemplateRepoPath);
            _githubUtils.Delete(parent);

            return("");
        }