Add GitHub statuses static context checkbox config

ee/app/controllers/concerns/ee/service_params.rb

@@ -5,7 +5,8 @@ module EE
       :multiproject_enabled,
       :pass_unstable,
       :project_name,
-      :repository_url
+      :repository_url,
+      :static_context
     ].freeze
 
     def allowed_service_params

ee/app/models/project_services/github_service.rb

@@ -3,6 +3,7 @@ class GithubService < Service
   include ActionView::Helpers::UrlHelper
 
   prop_accessor :token, :repository_url
+  boolean_accessor :static_context
 
   delegate :api_url, :owner, :repository_name, to: :remote_project
 
@@ -31,8 +32,20 @@ class GithubService < Service
 
   def fields
     [
-      { type: 'text', name: "token", required: true, placeholder: "e.g. 8d3f016698e...", help: 'Create a <a href="https://github.com/settings/tokens">personal access token</a> with  <code>repo:status</code> access granted and paste it here.'.html_safe },
-      { type: 'text', name: "repository_url", title: 'Repository URL', required: true, placeholder: 'e.g. https://github.com/owner/repository' }
+      { type: 'text',
+        name: "token",
+        required: true,
+        placeholder: "e.g. 8d3f016698e...",
+        help: 'Create a <a href="https://github.com/settings/tokens">personal access token</a> with  <code>repo:status</code> access granted and paste it here.'.html_safe },
+      { type: 'text',
+        name: "repository_url",
+        title: 'Repository URL',
+        required: true,
+        placeholder: 'e.g. https://github.com/owner/repository' },
+      { type: 'checkbox',
+        name: "static_context",
+        title: 'Static status check names',
+        help: 'GitHub status checks need static name in order to be marked as "required".' }
     ]
   end