docs: add Ruby deploy guide and runnable example for Datum compute#135
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The Go, Rust, Node.js, Python, PHP, and Ruby deploy guides and their runnable examples/ apps have moved to their own focused PRs (#130-#135). Dropping them here keeps this PR scoped to the ConfigMap/Secret mount feature and shrinks the diff for reviewers. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What this delivers
A complete, copy-pasteable path for a developer to take a Ruby HTTP service from source to a live, reachable Instance on Datum compute.
docs/guides/deploy-a-ruby-app.md): build a Ruby app into a Unikraft unikernel image, publish it to the metro registry, deploy it withdatumctl compute deploy, verify the live HTTP response, update, and clean up. Includes a troubleshooting section covering the common Ruby-on-unikernel failure modes (rootfs RAM-disk overflow, missing shared libraries, image-pull and scheduling issues).examples/hello-ruby/): the guide's files materialized as a ready-to-deploy folder so users can clone and ship without copying snippets out of prose:server.rb— the Ruby service (stdlib only)Dockerfile— builds the trimmed Ruby rootfsKraftfile— Unikraft Cloud packagingworkload.yaml— the DatumWorkloadmanifestREADME.md— one-line description, link back to the guide, and the key build + deploy commandsThe guide links out to the example, and the example links back to the guide, so either entry point lands the user in the right place.
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