docs(ddns-updater): sync playground coverage

[mberlofa]

Summary

• add ddns-updater to the playground chart config mapping after the chart template behavior update

Validation

• npm run lint
• npm run format:check
• npm run build
• make site-sync-check CHART=ddns-updater
• make release-check REPO=site
• make attribution-check REPO=site

Chart PR: helmforgedev/charts#657
Issue: helmforgedev/charts#633

Summary by CodeRabbit

• New Features
  • Added support for the ddns-updater chart in the playground, allowing it to appear in the available chart list when applicable.
• Bug Fixes
  • Improved chart inclusion behavior so playground results now reflect the configured site sync entries more accurately.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: de0be810-7eab-4254-a6c0-3fcc201bb253

📥 Commits

Reviewing files that changed from the base of the PR and between 9ae2561 and b19a411.

📒 Files selected for processing (1)

• src/pages/playground.astro

🚧 Files skipped from review as they are similar to previous changes (1)

• src/pages/playground.astro

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📝 Walkthrough

Walkthrough

This change adds the ddns-updater chart slug to the siteSyncPlaygroundConfigs allowlist in src/pages/playground.astro, so it can be included in the computed playgroundCharts list.

Changes

Playground config allowlist update

Layer / File(s)	Summary
Add ddns-updater slug src/pages/playground.astro	Adds ddns-updater to siteSyncPlaygroundConfigs, making it eligible for playgroundCharts selection.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• helmforgedev/site#322: Also extends siteSyncPlaygroundConfigs in src/pages/playground.astro to include a new chart slug.
• helmforgedev/site#330: Updates the same allowlist registry in src/pages/playground.astro with another chart slug entry.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly names the ddns-updater playground coverage sync and matches the single main change.
Description check	✅ Passed	The description includes a summary, validation commands, and issue/chart references, which is mostly complete for this template.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/ddns-updater-template-standards-sync

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