How to specify a custom namespace to deploy with Cloud Deploy and Helm?

[msonnleitner]

Maybe I missed something, but I didn't find an option to do that.

Target does not provide an option for namespace

apiVersion: deploy.cloud.google.com/v1
kind: DeliveryPipeline
metadata:
  name: my-app
description: main application pipeline
serialPipeline:
  stages:
    - targetId: dev-1
      profiles: [ ]
---
apiVersion: deploy.cloud.google.com/v1
kind: Target
metadata:
  name: dev-1
description: development cluster
gke:
  cluster: projects/my-project/locations/europe-west1/clusters/gke1

 Providing a namespace in the skaffold.yaml didn't work 

apiVersion: skaffold/v2beta26
kind: Config
metadata:
  name: my-app
build:
  artifacts:
  - image: eu.gcr.io/my-repo/my-app
    ko:
      dir: services/my-app
deploy:
  helm:
    releases:
    - name: my-app
      chartPath: helm/my-app
      namespace: my-ns
      artifactOverrides:
        images.myApp: eu.gcr.io/my-repo/my-app

Any other options or suggestions?