[CI/Build] Push latest tag for cpu and neuron docker image

[22quinn]

Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.

Purpose

docker tag only creates local tag. This PR adds the step to push the latest tag to docker registry.
Fix #19869

Test Plan

simple docker push

Test Result

N/A

(Optional) Documentation Update

[github-actions]

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[gemini-code-assist]

Summary of Changes

Hello @22quinn, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue where the latest Docker image tags for CPU and Neuron builds were not being pushed to the public ECR registry, despite being created locally. My changes ensure that these latest tags are now properly published as part of the CI/CD release pipeline, making it easier for users to pull the most recent stable versions of the images.

Highlights

• CI/CD Pipeline Enhancement: I've updated the .buildkite/release-pipeline.yaml to explicitly push the latest Docker image tag for both the CPU and Neuron builds to the public ECR registry. Previously, the latest tag was only created locally during the build process but not pushed.
• Docker Image Publishing: Specifically, I added a docker push command for the vllm-cpu-release-repo:latest image after its build step, and similarly for the vllm-neuron-release-repo:latest image.

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[gemini-code-assist]

Code Review

This pull request adds a step to push the latest tag to the Docker registry for both CPU and Neuron Docker images. The changes involve adding a docker push command for the latest tag in the release pipeline YAML file.