docs: add persistent volume warning to changelog

[githubsaturn]

Summary

• Add the persistent volume label conflict warning to the next-version changelog.
• Link the merged frontend implementation in feat(app-configs): warn when persistent volume label is used by other apps caprover-frontend#226.

Validation

• Confirmed the changelog diff contains exactly one added line.

Summary by CodeRabbit

• Documentation
  • Added a changelog entry warning when persistent volume labels are already used by another application.
  • Included a reference link for additional context.

[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: 2f4b225b-c34d-40a9-b92b-4192bc140383

📥 Commits

Reviewing files that changed from the base of the PR and between 1e70bba and 335ec29.

📒 Files selected for processing (1)

• CHANGELOG.md

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📝 Walkthrough

Walkthrough

The changelog adds an unreleased-version entry for warnings about persistent volume labels already associated with another application. The entry references PR-226.

Changes

Persistent volume warning

Layer / File(s)	Summary
Add persistent volume warning entry CHANGELOG.md	The next unreleased changelog section documents the persistent volume label warning and references PR-226.

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

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the changelog update for the persistent volume warning.
Description check	✅ Passed	The description explains the change, references the implementation, and records validation results.
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 agent/add-volume-warning-changelog-226

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