ci: expand database test matrix

[major]

Summary

• Expand the manual database workflow across major MySQL and MariaDB container versions.
• Keep matrix jobs independent with vendor-specific health checks and no fail-fast behavior.
• Fail help and verbose runs when Perl uninitialized-value warnings appear.

Validation

• Ruby YAML parse OK.
• git diff --check OK.
• perl -c mysqltuner.pl OK.
• skopeo resolved all matrix image tags.
• Local CodeRabbit review found 0 findings.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci-db-version-matrix

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