Document APPROVER_GITHUB_APP_ID and APPROVER_GITHUB_APP_PRIVATE_KEY_PATH env vars

[Oded-B]

Description

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Type of Change

• [ ] Bug Fix
• [ ] New Feature
• [ ] Breaking Change
• [ ] Refactor
• [ ] Documentation
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Checklist

• [ ] I have read the contributing guidelines
• [ ] Existing issues have been referenced (where applicable)
• [ ] I have verified this change is not present in other open pull requests
• [ ] Functionality is documented
• [ ] All code style checks pass
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• [ ] All new and existing tests pass