chore: pin third-party actions to commit SHAs

[erwan-joly]

Pins every non-GitHub-owned action in this repo to a full-length commit SHA, keeping the version tag as a trailing comment.

A tag is a moving pointer — whoever controls the upstream repo (or compromises that maintainer's account) can repoint it and change what executes here. These steps run with contents: write or cloud credentials in scope, so that matters.

No version changes: each SHA is the exact commit the pinned tag resolved to today. Part of a sweep across the org so sha_pinning_required can be turned on afterwards.

Summary by CodeRabbit

• Chores
  • Improved release reliability by pinning the release automation to a specific, verified version.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Advanced

Run ID: 0491ad5d-5201-4358-9ec0-75cffff491cc

📥 Commits

Reviewing files that changed from the base of the PR and between 023ef9d and 272cc2c.

📒 Files selected for processing (1)

• .github/workflows/dotnet.yml

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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Walkthrough

The release job now references softprops/action-gh-release by commit SHA instead of the mutable v3 tag.

Changes

Release workflow

Layer / File(s)	Summary
Pin release action .github/workflows/dotnet.yml	The release job pins softprops/action-gh-release to commit efb35369e0ad2afab669f228072c1b0d510eae64 and retains the v3 version comment.

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

Merge Risk: ⚪ Minimal · up to 272cc

The release workflow keeps the same action version while preventing mutable-tag changes, with no remaining merge-blocking risk identified.

🚥 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 and concisely describes the main change: pinning third-party GitHub Actions to commit SHAs.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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 harden/pin-third-party-actions

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