ci: correct the blank SHA case for releases

[crookedstorm]

Summary by CodeRabbit

• Bug Fixes

  • Improved release workflow handling when an optional source revision is not provided.
  • Added validation to prevent releases from using a source revision unrelated to the selected workflow revision.

• Documentation

  • Clarified release input descriptions for selective Helm artifact inclusion and NGC metadata synchronization.

[svvarom]

LGTM. For context https://github.com/NVIDIA-NeMo/nemo-platform/actions/runs/29286104607

[svvarom]

hit the wrong button

[coderabbitai]

📝 Walkthrough

Walkthrough

The release workflow updates dispatch input descriptions, makes optional release-plan inputs null-safe, and adds a Git ancestry check requiring the selected source SHA to precede the workflow revision.

Changes

Release workflow

Layer / File(s)	Summary
Release inputs and plan resolution .github/workflows/release.yaml	Dispatch descriptions now clarify Helm artifact selection and current-branch NGC metadata synchronization; missing source-sha and version inputs are handled safely.
Source revision ancestry gate .github/workflows/release.yaml	A post-checkout step fails unless SOURCE_SHA is an ancestor of GITHUB_SHA.

Suggested reviewers: svvarom

🚥 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 matches the main fix: handling a blank source SHA during release planning.
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 correct-release-setup/crookedstorm

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In @.github/workflows/release.yaml:
- Around line 59-64: Correct the description for the update-ngc-metadata
workflow input by removing the duplicated article, changing “from the this
branch” to “from this branch” or equivalent wording.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 7f36baa5-67e4-4dad-aa2a-2c60a1074067

📥 Commits

Reviewing files that changed from the base of the PR and between 77d897e and 0e6b2eb.

📒 Files selected for processing (1)

• .github/workflows/release.yaml

[github-actions]

Suite	Lines Covered	Line Rate	Branch Rate
Unit Tests	23853/31009	76.9%	61.7%
Integration Tests	13817/29658	46.6%	19.6%