fix: remove schema field from pipeline config returned by spinnaker (…

…#19)

This field was introduced after Spinnaker 1.27 and causes perpetual diffs, so we just ignore it like we already do with the other Spinnaker-managed fields.

spinnaker/resource_pipeline.go

@@ -249,6 +249,7 @@ func editAndEncodePipeline(pipeline map[string]interface{}) (string, error) {
 	delete(pipeline, "id")
 	delete(pipeline, "index")
 	delete(pipeline, "name")
+	delete(pipeline, "schema")
 	delete(pipeline, "updateTs")
 
 	encoded, err := json.Marshal(pipeline)