Hi everyone, would someone be able to tell me if in the Kubernetes Operator Stack CRD you can specify custom values that can be used by the stack that is held in the git repo? In the example https://github.com/pulumi/pulumi-kubernetes-operator/blob/master/stack-examples/yaml/nginx_k8s_stack.yaml I can see that the envRef

PULUMI_ACCESS_TOKEN

is set. Can we add custom envRefs? Many thanks.