Add a link to the 'danger-review' job

Signed-off-by: Rémy Coutable <remy@rymai.me>

Dangerfile

@@ -7,8 +7,12 @@ danger.import_plugin('danger/plugins/helper.rb')
 danger.import_plugin('danger/plugins/roulette.rb')
 danger.import_plugin('danger/plugins/changelog.rb')
 
-unless helper.release_automation?
-  GitlabDanger.new(helper.gitlab_helper).rule_names.each do |file|
-    danger.import_dangerfile(path: File.join('danger', file))
-  end
+return if helper.release_automation?
+
+gitlab_danger = GitlabDanger.new(helper.gitlab_helper)
+
+gitlab_danger.rule_names.each do |file|
+  danger.import_dangerfile(path: File.join('danger', file))
 end
+
+markdown("**If needed, you can retry the [`danger-review` job](#{ENV['CI_JOB_URL']}) that generated this comment.**") if gitlab_danger.ci?