build: adding provenance generation to ruby release-please workflow

[rsoberano-ld]

Requirements

• [ ] I have added test coverage for new or changed functionality
• [ ] I have followed the repository's pull request submission guidelines
• [ ] I have validated my changes against all supported platform versions

Related issues

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Describe the solution you've provided

Using Github SLSA generator to generate build provenance for ruby-server-sdk

Implementation based off of previous SDK SLSA integrations with release-please

Describe alternatives you've considered

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Additional context

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