chore(ci): pin actions to immutable commit SHAs

[yordis]

• Mutable tags let an upstream maintainer change what runs here after the fact, and pinning is a prerequisite for turning on the organization SHA pinning policy without taking CI down.

[cursor]

PR Summary

Low Risk
CI-only workflow edits that pin existing action versions without changing job logic or application code.

Overview
Pins all third-party GitHub Actions in CI and Release Please workflows to full commit SHAs instead of mutable version tags (@v5.0.0, etc.), with the original tag kept in a trailing comment for readability.

Affected actions: actions/checkout, bufbuild/buf-setup-action, actions/setup-go, golangci/golangci-lint-action, and googleapis/release-please-action. Runtime behavior is unchanged at the pinned revisions; the goal is supply-chain hardening and compatibility with org policies that require SHA pinning.

^{Reviewed by Cursor Bugbot for commit e7a03f0. Bugbot is set up for automated code reviews on this repo. Configure here.}

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Team

Run ID: 1e4be10c-aaaf-4d5d-a6da-033d9b5e24f2

📥 Commits

Reviewing files that changed from the base of the PR and between 5819153 and e7a03f0.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• .github/workflows/release-please.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 CI and release workflows now pin GitHub Actions to immutable commit SHAs. Existing version comments, Go configuration, and workflow behavior remain unchanged.

Changes

Workflow action pinning

Layer / File(s)	Summary
Pin workflow action references .github/workflows/ci.yml, .github/workflows/release-please.yml	Checkout, Buf setup, Go setup, golangci-lint, and Release Please actions now use immutable commit SHAs. Existing version annotations and Go configuration remain unchanged.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to e7a03

This change makes CI and release automation use immutable action revisions without altering the workflows’ intended behavior. No actionable merge-blocking risk remains beyond normal checks and review.

Poem

A rabbit checks each workflow line
And pins each action firm and fine
SHA by SHA, the paths stay clear
Version notes remain near
CI hops safely through the gate

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: pinning CI actions to immutable commit SHAs.
Description check	✅ Passed	The description explains why the CI action references use immutable commit SHAs and relates directly to the changeset.
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.

Full details: Docstring Coverage

Explanation

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 files. (2 skipped: 2 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch yordis/chore-pin-actions

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