Feat: Update Readme to add how to publish model engine image

[postevanus-scale]

Pull Request Summary

What is this PR changing? Why is this change being made? Any caveats you'd like to highlight? Link any relevant documents, links, or screenshots here if applicable.

Test Plan and Usage Guide

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Greptile Summary

Adds documentation for publishing the Model Engine Docker image to the public ECR registry (public.ecr.aws/b2z8n5q1/model-engine). The new section covers building from the repo root, authenticating with the ml-admin AWS profile, and tagging/pushing the image.

• New "Publishing the Docker Image" section appended to model-engine/README.md
• Build instructions correctly reference the repo root as the Docker context with model-engine/Dockerfile
• Authentication uses us-east-1 region as required by public ECR
• No code changes; documentation only

Confidence Score: 5/5

• This PR is safe to merge — it contains only documentation additions to the README with no code changes.
• Score of 5 because this is a documentation-only change that adds accurate Docker publishing instructions. The build command, Dockerfile path, and ECR registry details are all consistent with the existing codebase. The AWS account ID was already present in the README. No functional code is modified.
• No files require special attention.

Important Files Changed

Filename	Overview
model-engine/README.md	Adds a "Publishing the Docker Image" section with build, authenticate, tag, and push instructions for the public ECR registry. Documentation-only change with accurate commands.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["Build Image\n<code>docker build --platform linux/amd64 . -f model-engine/Dockerfile</code>"] --> B["Authenticate\n<code>aws ecr-public get-login-password</code>\nRegion: us-east-1, Profile: ml-admin"]
    B --> C["Tag Image\n<code>docker tag model-engine:TAG public.ecr.aws/b2z8n5q1/model-engine:TAG</code>"]
    C --> D["Push to Public ECR\n<code>docker push public.ecr.aws/b2z8n5q1/model-engine:TAG</code>"]

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_{Last reviewed commit: d9df340}