[AIG-855] Bump CI actions to Node 24 runtime + align Node version (release.yml 20→22)

[blackms]

Summary

Addresses the GitHub deprecation (Node.js 20 actions force-migrated to Node 24 on June 2, 2026) and fixes a Node-version misalignment between workflows. CI-config only — no job logic changed.

Changes

• actions/checkout @v4 → @v5, actions/setup-node @v4 → @v5 (Node 24 runtime) across ci.yml, release.yml, release-docker.yml.
• actions/cache @v4 → @v5, actions/upload-artifact @v4 → @v6 in ci.yml.
• release.yml node-version: 20 → 22 to align with ci.yml (was the source of the misalignment).

Why not redundant

Before this PR, main still pins actions/*@v4 (Node 20 runtime) and release.yml was on Node 20 while ci.yml is on 22.

Note on overlap

A separate in-flight PR (AIG-854) also touches ci.yml (adds a test-repeat step). If that merges first, this branch may need a trivial ci.yml rebase.

Scope

• 3 workflow files, versions only. No job/step logic touched.

Closes AIG-855.

Summary by CodeRabbit

• Chores
  • Updated GitHub Actions across CI/CD workflows, including Docker release pipeline actions, to newer major versions for improved stability and security.
  • Upgraded Node.js runtime used by the release workflow from v20 to v22.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6dcfa083-3a15-47f2-a53c-54000ac16277

📥 Commits

Reviewing files that changed from the base of the PR and between 2f1f637 and b3218fe.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

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📝 Walkthrough

Walkthrough

This PR upgrades GitHub Actions across three workflows: .github/workflows/ci.yml, .github/workflows/release-docker.yml, and .github/workflows/release.yml. Actions are bumped to newer major versions (checkout/setup-node → v5, cache → v5, upload-artifact → v6, codecov → v6, docker/build-push → v7, gh-release → v3). Release workflow Node runtime → 22.

Changes

GitHub Actions and Node.js Version Upgrades

Layer / File(s)	Summary
CI workflow action upgrades .github/workflows/ci.yml	All CI job steps (typecheck, lint, test, consensus-flake-guard, build, coverage) upgrade actions/checkout and actions/setup-node to @v5. Build job upgrades actions/cache to @v5 and actions/upload-artifact to @v6. Coverage job upgrades codecov/codecov-action to @v6.
Docker release workflow action upgrades .github/workflows/release-docker.yml	Docker release workflow upgrades actions/checkout, QEMU setup, docker/setup-buildx-action, docker/login-action, and docker/metadata-action to newer majors; docker/build-push-action is upgraded from @v6 to @v7.
Release workflow action upgrades and Node.js version bump .github/workflows/release.yml	Release workflow upgrades actions/checkout and actions/setup-node to @v5, updates Node.js runtime from 20 to 22, and upgrades softprops/action-gh-release from @v1 to @v3.

🎯 2 (Simple) | ⏱️ ~8 minutes

🐰 A hop through the actions we go,
From versions old to brand new flow,
Node twenty-two hops into place,
The CI pipelines run with grace! 🚀
Dependencies dance in the night,
All upgraded, shiny, and bright. ✨

🚥 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 accurately describes the main changes: bumping CI actions to support Node 24 runtime and aligning the Node version in release.yml from 20 to 22.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch pm-agent/ci-node24-bump

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