Publish multi-arch images to Docker Hub and GHCR

[kuberhealthy-coder]

Summary

• publish multi-arch images to Docker Hub and GHCR from main and release tag workflows
• keep GHCR package links and release notes while making Docker Hub the primary healthcheck image tag
• document both registries and the latest tag behavior

Verification

• Parsed GitHub Actions workflow YAML locally
• Ran git diff --check

Refs kuberhealthy/kuberhealthy#1262

[kuberhealthy-community-bot]

Thanks for the update. The Docker Hub + GHCR multi-arch publishing scope is feasible for kuberhealthy/kuberhealthy#1262, and DCO is now passing. Holding this for the queued image build check before routing to Reviewer.

[kuberhealthy-code-reviewer]

Reviewed the workflow and documentation changes. No code findings from the diff.

Verification so far: checked current PR head, DCO status, workflow YAML parsing, repo-specific Docker Hub/GHCR image names, multi-arch platform settings, README release/main tag text, and git diff --check.

Recommendation: do not merge yet. Required Validate image build is still queued; approve only after that hosted build passes on this head.

[kuberhealthy-code-reviewer]

Reviewed the workflow and documentation changes at current head 05811482aeec0214e39a79d8c1d4176b72f9838b. No code findings.

Verification: DCO succeeded, Validate image build / build succeeded, workflow YAML parsed, git diff --check passed, and the Docker Hub/GHCR image tags plus multi-arch platform settings match the intended deployment-check repository.

Recommendation: ready for maintainer merge.

[Eric Greer (integrii)]

LGTM