cannot use spec.Volumes.Additional (variable of type []"github.com/crunchydata/postgres-operator/pkg/apis/postgres-operator.crunchydata.com/v1beta1".AdditionalVolume) as []*"github.com/crunchydata/postgres-operator/pkg/apis/postgres-operator.crunchydata.com/v1beta1".AdditionalVolume value in argument to addAdditionalVolumesToSpecifiedContainers