Version checks include the branch

lib/discourse.rb

@@ -201,6 +201,16 @@ module Discourse
     end
   end
 
+  def self.git_branch
+    return $git_branch if $git_branch
+
+    begin
+      $git_branch ||= `git rev-parse --abbrev-ref HEAD`.strip
+    rescue
+      $git_branch = "unknown"
+    end
+  end
+
   # Either returns the site_contact_username user or the first admin.
   def self.site_contact_user
     user = User.find_by(username_lower: SiteSetting.site_contact_username.downcase) if SiteSetting.site_contact_username.present?