feat(docker): Add multi-platform support for Docker build

[gondoi]

No description provided.

[cursor]

PR Summary

Medium Risk
Changes the CI/CD path that builds and publishes Docker images and moves the logic to an external reusable workflow pinned by SHA, so misconfiguration could break releases or publish incorrect images.

Overview
Docker publishing is refactored to stop using the local composite action ./.github/actions/docker-publish (now removed) and instead call a pinned reusable workflow FuelLabs/github-actions/.github/workflows/docker-build-push.yml@<sha>.

The docker_publish workflow drops the matrix-based job and adds an explicit build-and-publish-sv-dune job that supports multi-platform builds (linux/amd64,linux/arm64), keeps the same tag scheme, and passes registry credentials via workflow secrets using GITHUB_TOKEN.

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[cursor]

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