More hardening with digitla ocean

some ref handling was a bit strange, now it's rendering correctly. I have a feeling we will be back to the diff engine at some point soon, it's picking up some strange changes that are so deep in the model, I can't determine what is what, so we will wait for another set of triggers to appear.

utils/nodes.go

@@ -10,6 +10,7 @@ func CreateRefNode(ref string) *yaml.Node {
     nodes := make([]*yaml.Node, 2)
     nodes[0] = CreateStringNode("$ref")
     nodes[1] = CreateStringNode(ref)
+    nodes[1].Style = yaml.SingleQuotedStyle
     m.Content = nodes
     return m
 }