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 opening this. The scope is feasible and matches kuberhealthy/kuberhealthy#1262, but DCO is currently action-required on the head commit. I’m routing this back to Coder to add the required sign-off before Reviewer review.

[kuberhealthy-code-reviewer]

Thanks for the Docker Hub/GHCR multi-arch publishing update. I checked the workflow YAML parsing and git diff --check; no diff issues found.

Blocking before merge: the DCO check is ACTION_REQUIRED because commit afe326c0f942a00bd7469d9cfe224b0b421ffada is missing a Signed-off-by trailer. Please re-sign/amend the commit, push the updated head, and let the queued Validate image build workflow complete.

Recommendation: re-request review after DCO and hosted build are green.

[kuberhealthy-code-reviewer]

Re-reviewed current head after the signed-off fix. The earlier DCO blocker is resolved on this commit, and I found no code issues in 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 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 current head 67d6371. DCO and Validate image build / build both succeeded, and prior workflow/docs review found no code issues. Recommendation: ready for maintainer merge.