I'd like to push my image to Docker Hub. Task seems to be simple, yet I lost with details.
- task: Docker@2
  displayName: Push image
  inputs:
    containerRegistry: |
      $(dockerHub)
    repository: username/repo
    command: push
    tags: latest
What should be the value of $(dockerHub) variable and how to construct it? These instructions seem to explain it, but I don't get it.


