text: Title: Alternate image publish location (vs docker.io)
  Body: ### What docker image(s) is this feature applicable to?
  
  base-notebook
  
  ### What changes are you proposing?
  
  Publish JupyterHub to an additional - or alternate - location
  
  See https://web.docker.com/rs/790-SSB-375/images/privatereposfaq.pdf
  
  - Docker has recently announced that 'free' organization repositories are going away in April. This will affect some open source projects that publish to dockerhub. I do not know if it affects Jupyter lab, or if the team has a paid account
  - The docker faq does state that open source projects can apply to get a free accouunt
  - Some projects publish to multiple repos. One option is 'quay.io'. I also know nginx use amazon. Even if docker.io is good for now, it may be worth considering publishing to an alternate repo
  
  Ref: https://github.com/odpi/egeria/issues/7530
  
  ### How does this affect the user?
  
  User would be unable to access a prebuilt docker stacks image
  
  ### Anything else?
  
  _No response_