ci(release): guard helm chart tag against non-semver mutable tag

[yaroslavmokflmg]

On push, version resolves to a mutable tag (latest/dev) which is not valid OCI semver for the helm chart releaser. Same guard as fleetmdm Ylianst#71: use 9.9.9 placeholder when version is the mutable tag, otherwise the real version. build_helm only stays green today because it's skipped when the chart is unchanged; a push that changes the chart would otherwise fail the helm release.

Summary by CodeRabbit

• Chores
  • Updated release/version handling to use the latest published release as the version source.
  • Improved fallback behavior during chart publishing when the version is marked as latest.
  • Tightened version validation to ensure release tags follow standard semantic version format.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 2efe07d1-9cdb-47f1-b114-882806b169cd

📥 Commits

Reviewing files that changed from the base of the PR and between 77509fb and 4e241e2.

📒 Files selected for processing (1)

• .github/workflows/release.yml

📝 Walkthrough

Walkthrough

Modifies CI workflow logic for release versioning: version.yml now resolves the latest release tag via GitHub's releases/latest API endpoint with x.y.z regex validation, replacing prior multi-release filtering/sorting logic; release.yml maps a 'latest' resolved version to '9.9.9' for the Helm chart tag instead of using 'latest' directly.

Changes

Release version tagging

Layer / File(s)	Summary
Version resolution and Helm tag mapping .github/workflows/version.yml, .github/workflows/release.yml	Dispatch version resolution now calls the GitHub releases/latest endpoint and validates the tag against an x.y.z regex, replacing prior filtering/sorting logic; Helm chart releaser tag maps a 'latest' version to '9.9.9' instead of using 'latest' directly.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• flamingo-stack/meshcentral#48: Overlaps with changes to Helm chart tag wiring using needs.version.outputs.version and related version.yml version-resolution logic.

Suggested reviewers: ivan-flamingo

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly reflects the main change: guarding the Helm chart tag from mutable non-semver values.
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 hotfix/helm-tag-guard

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