Enable Ruby Mac artifact build
diff --git a/tools/run_tests/artifact_targets.py b/tools/run_tests/artifact_targets.py
index 317111e..7e4601e 100644
--- a/tools/run_tests/artifact_targets.py
+++ b/tools/run_tests/artifact_targets.py
@@ -228,4 +228,5 @@
           [PythonArtifact('linux', 'x86'),
            PythonArtifact('linux', 'x64'),
            RubyArtifact('linux', 'x86'),
-           RubyArtifact('linux', 'x64')])
+           RubyArtifact('linux', 'x64'),
+           RubyArtifact('macos', 'x64')])