chore: fix incorrect ManifestSpec.MarshalYAML signature

Remove pointer from method, because otherwise MarshalYAML doesn't work when called from type asserted empty interface.

Signed-off-by: Dmitriy Matrenichev <[email protected]>

pkg/machinery/resources/k8s/manifest.go

@@ -29,7 +29,7 @@ func (spec ManifestSpec) DeepCopy() ManifestSpec {
 }
 
 // MarshalYAML implements yaml.Marshaler.
-func (spec *ManifestSpec) MarshalYAML() (interface{}, error) {
+func (spec ManifestSpec) MarshalYAML() (interface{}, error) {
 	return spec.Items, nil
 }