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

Docker Buildx Integration

• Replace sequential make commands with docker/build-push-action@v5
• Fix ARM64 hanging issues
• Enable parallel multi-platform building (amd64,ppc64le,arm64)

Improvements

• Add GitHub Actions caching (type=gha) for faster builds
• Eliminate timeout issues with better resource management
• Apply to all build scenarios: SHA tags, latest, and version builds

Fixes ARM64 emulation reliability while maintaining compatibility
with existing deployment workflows. Address issue #616

Successful build: https://github.com/yehudit1987/notebooks/actions/runs/18098040267/job/51493584369

[google-oss-prow]

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[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