Add multi-arch builds for c10s and c9s pg18 images

[kkyrazis]

Enables multi-arch builds for c10s postgres images.

Action run on my fork targeting only the c10s images.https://github.com/kkyrazis/postgresql-container/actions/runs/31413694674/job/93537569457:

End result in my quay repo: https://quay.io/repository/kkyrazis/postgresql-16-c10s

Fixes: #668

Assisted-by: Claude noreply@anthropic.com

[coderabbitai]

📝 Walkthrough

Walkthrough

The workflow now builds PostgreSQL 18 c9s and all c10s images with the multi-architecture path. The single-architecture path excludes these images and continues to process the remaining matrix entries.

Changes

Image build routing

Layer / File(s)	Summary
Architecture-specific build selection .github/workflows/build-and-push.yml	The multi-architecture build includes PostgreSQL 18 c9s and all c10s Dockerfiles. The single-architecture build excludes those Dockerfiles.

Estimated code review effort: 2 (Simple) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the multi-architecture build changes for c10s and c9s PostgreSQL 18 images, which matches the stated objectives.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

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Triggered by Workflow Run