Code changes for updating Drop comment in PR (#1837)

Gemfile

@@ -12,6 +12,7 @@ group :development, :test do
   gem 'vcr'
 end
 
+gem 'octokit', '~> 4.0'
 gem 'azure_mgmt_analysis_services',         path: 'management/azure_mgmt_analysis_services'
 gem 'azure_mgmt_api_management',            path: 'management/azure_mgmt_api_management'
 gem 'azure_mgmt_authorization',             path: 'management/azure_mgmt_authorization'

scripts/pr_build_drop_publisher.rb

@@ -0,0 +1,24 @@
+# encoding: utf-8
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for license information.
+
+require 'octokit'
+
+github_access_token = ARGV[0]
+pull_request_number = ARGV[1]
+build_number        = ARGV[2]
+
+comment_body = "
+# Ruby Build Drop - Direct download
+The Gem file (zipped version) could be downloaded [here](https://azuresdkci.westus2.cloudapp.azure.com/job/RubylangSDK_BuildDrop/#{build_number}/Azure/processDownloadRequest/azure-sdk-for-ruby/pullrequests/#{pull_request_number}/azure-sdk-for-ruby_pr#{pull_request_number}.tar.gz).
+"
+
+gh_client = Octokit::Client.new(
+    :access_token => github_access_token
+)
+
+gh_client.add_comment(
+  "Azure/azure-sdk-for-ruby",
+  pull_request_number,
+  comment_body
+)