apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: noti-secret
  namespace: default
spec:
  components: []
  workflow:
    steps:
    - name: notification
      type: notification
      properties:
        slack:
          url:
            secretRef:
              name: my-secret
              key: url
          message:
            text: hello world