Update setup-rust consumers for Node.js 24 (#81)

[lodyai]

Summary

This branch pins every root and generated-template leynos/shared-actions
consumer to commit
80c8e8b4b9e8ab223d18d2360aa1feba6c7335e8.
That shared-actions commit upgrades every direct Node.js 20 dependency in
setup-rust to a verified full commit SHA for a Node.js 24 release, removing
GitHub's temporary compatibility fallback without changing the action
interface or cache behaviour.

Closes #81.

The shared-actions branch is published, but the current GitHub integration
cannot open its prerequisite pull request (Resource not accessible by integration). This consumer pull request therefore remains a draft until a
maintainer lands the shared-actions commit on main.

Review walkthrough

• Start with the root
  CI,
  act validation
  and
  Dependabot automerge
  callers to verify the parent repository revision.
• Review the generated
  CI,
  coverage,
  audit,
  act validation,
  mutation testing
  and
  release
  callers to verify that generated projects use the same revision.

Validation

• make check-fmt: passed
• make typecheck: passed with no issues in 30 source files
• make lint: passed
• make test: 89 passed, one skipped, one snapshot passed
• make spelling: passed
• coderabbit review --agent: passed with zero findings
• Upstream action.yml metadata at each replacement SHA declares node24.
• Captured shared-actions validation logs contain no Node.js 20 deprecation
  warning.

References

• Issue #81
• Backlink PR #79
• Shared-actions commit
• Lody session

Summary by Sourcery

Pin all root and template GitHub workflow consumers of leynos/shared-actions to the shared commit 80c8e8b4b9e8ab223d18d2360aa1feba6c7335e8 so CI, coverage, audit, mutation testing, release, act validation, and Dependabot automerge use the updated Node.js 24–compatible setup-rust and related actions.

Enhancements:

• Standardize on a single verified shared-actions revision across the repository to remove reliance on older Node.js 20-based action commits while keeping the action interfaces and caching behaviour unchanged.

CI:

• Update all CI and auxiliary workflows (including act validation and Dependabot automerge) to reference the new shared-actions commit for setup-rust and related actions.

Tests:

• Align generated project CI, coverage, audit, mutation testing, and release workflow templates with the same shared-actions commit to ensure consistent Node.js 24–compatible tooling across templates.

[coderabbitai]

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Pins all root and template GitHub Actions workflow consumers of leynos/shared-actions to a single new commit SHA that upgrades the setup-rust action (and related shared workflows) to Node.js 24 without changing their public interface or cache behavior.

File-Level Changes

Change	Details	Files
Update all GitHub Actions workflow references to leynos/shared-actions to the new Node.js 24-compatible commit SHA.	Pin setup-rust action usages in root CI and act-validation workflows to commit 80c8e8b4b9e8ab223d18d2360aa1feba6c7335e8. Pin shared dependabot-automerge reusable workflow in the root workflow to commit 80c8e8b4b9e8ab223d18d2360aa1feba6c7335e8. Update template CI and coverage workflows to use setup-rust and generate-coverage from commit 80c8e8b4b9e8ab223d18d2360aa1feba6c7335e8. Update template CI and coverage workflows to use upload-codescene-coverage from commit 80c8e8b4b9e8ab223d18d2360aa1feba6c7335e8 (including commented example). Pin template act-validation and audit workflows’ setup-rust usage to commit 80c8e8b4b9e8ab223d18d2360aa1feba6c7335e8. Pin template mutation-testing workflow’s reusable mutation-cargo workflow to commit 80c8e8b4b9e8ab223d18d2360aa1feba6c7335e8. Update the app-flavour release workflow template to use setup-rust from commit 80c8e8b4b9e8ab223d18d2360aa1feba6c7335e8.	.github/workflows/ci.yml .github/workflows/act-validation.yml .github/workflows/dependabot-automerge.yml template/.github/workflows/ci.yml.jinja template/.github/workflows/coverage-main.yml.jinja template/.github/workflows/act-validation.yml template/.github/workflows/audit.yml template/.github/workflows/mutation-testing.yml template/.github/workflows/{% if flavour == 'app' %}release.yml{% endif %}.jinja

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#81	Update the .github/actions/setup-rust composite action dependencies (e.g., actions/cache, mozilla-actions/sccache-action) in leynos/shared-actions to Node.js 24–compatible releases, pinned to verified full commit SHAs, so that setup-rust no longer emits Node.js 20 deprecation warnings.	❌	This PR only updates consumer workflows in leynos/agent-template-rust to pin leynos/shared-actions to commit 80c8e8b4b9e8ab223d18d2360aa1feba6c7335e8. It does not modify .github/actions/setup-rust or its internal dependencies in the leynos/shared-actions repository.
#81	Maintain the existing setup-rust action interface and cache behaviour while updating its dependencies, and update any tests, fixtures, snapshots, documentation, and dependency metadata in leynos/shared-actions that assert the old SHAs.	❌	The PR changes only consumer workflow references (root and template workflows) to point at the new shared-actions commit. It does not touch tests, fixtures, documentation, or metadata in the leynos/shared-actions repository, nor does it verify or preserve the setup-rust interface directly.
#81	Update consumer repositories to pin their leynos/shared-actions references to the new shared-actions commit SHA that contains the Node.js 24 updates for setup-rust.	✅

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