feat: Migrate kubeflow/kubeflow jwa_docker_publish.yaml

[yehudit1987]

Migrate Jupyter Web App Docker publish workflow from kubeflow/kubeflow
to kubeflow/notebooks with multi-platform build improvements.

Key Changes

Migration

• Move workflow to notebooks repo structure
• Update image registry to ghcr.io/kubeflow/notebooks/jupyter-web-app

Successful build: https://github.com/yehudit1987/notebooks/actions/runs/18833587264/job/53729515972

[andyatmiami]

/hold

I want to make sure:

• we finalize the decision on container registry
• we appropriately "seed" a package to appropriate container registry so desired permissions are in place

[andyatmiami]

this is interesting but not included in the original https://github.com/kubeflow/kubeflow/blob/master/.github/workflows/jwa_docker_publish.yaml

can you comment on the benefits of adding this setting? and furthermore - could we use {{env.ARCH}} here to not have a "future sync issue" with this being separately hard-coded?

If we cannot use {{env.ARCH} outright - I'd probably suggest removing this.. but I'm still interested in understanding what prompted the inclusion!

[yehudit1987]

Ok, so to be honest, I think this is leftover from some previous issues we encountered with the ARM platform. The main purpose of this step is just to specify which platforms to install, whereas the default behavior would be to set up QEMU for all platforms. Unfortunately, we can’t directly use {{env.ARCH}} here because it includes the linux/ prefix. So overall, I think the cleanest approach would be to remove this step entirely.

[andyatmiami]

/ok-to-test

[andyatmiami]

/lgtm

Thanks @yehudit1987 - good to finally be at a place to get this merged. appreciate your work!

Verified on fork:

• https://github.com/andyatmiami/kubeflow-notebooks/actions/runs/18958843845/job/54141699277
  • note: small commit to point to my repo
    • andyatmiami@0aac6f4

Image available:

• https://github.com/andyatmiami/kubeflow-notebooks/pkgs/container/kubeflow-notebooks%2Fjupyter-web-app

[andyatmiami]

/unhold

[kimwnasptd]

Thanks for the yet another great PR @yehudit1987!

/approve

[google-oss-prow]

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