Added jenkins slave ruby role

Change-Id: I6adc6e1539d0ac009c9795404b9de3e114f7dd81
diff --git a/jenkins/slave/ruby.yml b/jenkins/slave/ruby.yml
new file mode 100644
index 0000000..9fd26c3
--- /dev/null
+++ b/jenkins/slave/ruby.yml
@@ -0,0 +1,12 @@
+classes:
+  - system.jenkins.slave
+parameters:
+  linux:
+    system:
+      package:
+        ruby:
+          version: latest
+        rbenv:
+          version: latest
+        ruby-build:
+          version: latest