Add Ruby to CodeQL

Author: dfed

.github/workflows/codeql.yml

@@ -24,6 +24,8 @@ jobs:
         include:
         - language: actions
           build-mode: none
+        - language: ruby
+          build-mode: none
         - language: swift
           build-mode: autobuild
         # CodeQL supports the following values keywords for 'language': 'actions', 'c-cpp', 'csharp', 'go', 'java-kotlin', 'javascript-typescript', 'python', 'ruby', 'rust', 'swift'