ci(actions): S3 ubuntu default CI + master-only branches

[DeliciousBuding]

Replace windows-latest daily CI with ubuntu-latest to cut Actions cost; limit triggers to master.

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📥 Commits

Reviewing files that changed from the base of the PR and between a0b6097 and e7bfeaa.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/actions-s3

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