feat(workloads): add Ruby developer workload

[Alejandro Poladura (alejandro-poladura)]

Summary

• Add Ruby 3.4 with MSYS2 DevKit workload via winget configure
• Include install shim, hello-world test, and manifest entry for CI
• Document the new workload in README and development guide

Notes

• Uses RubyInstallerTeam.RubyWithDevKit.3.4 (Ruby 3.4 + MSYS2 DevKit) so gems with C extensions can compile out of the box.
• Follows the same pattern as Go/Python: single winget package, thin install shim, hello-world test.
• CI should auto-discover the new flow from manifest.yml — no workflow changes needed.

Test plan

• CI picks up ruby flow from manifest.yml automatically
• winget configure applies src/Workloads/ruby/configuration.winget
• Hello-world test prints Hello, world! and matches expected.txt

[Alejandro Poladura (alejandro-poladura)]

@microsoft-github-policy-service agree