Fix: Ensure Rust toolchain is present for pre-commit-autoupdate workflow

[alexdewar]

Description

Apologies for all the pre-commit-related faffing... it seems the last fix wasn't actually sufficient. I've tested that the workflow runs in this branch now (minus actually getting it to open a PR), so hopefully this is the last one 😄.

It seems the pre-commit autoupdate Action also runs pre-commit after updating, so it needs a Rust toolchain for, e.g., the cargo fmt hook.

Fix by ensuring the Rust toolchain is present for this workflow.

Type of change

• Bug fix (non-breaking change to fix an issue)
• New feature (non-breaking change to add functionality)
• Refactoring (non-breaking, non-functional change to improve maintainability)
• Optimization (non-breaking change to speed up the code)
• Breaking change (whatever its nature)
• Documentation (improve or add documentation)

Key checklist

• All tests pass: $ cargo test
• The documentation builds and looks OK: $ cargo doc
• Update release notes for the latest release if this PR adds a new feature or fixes a bug
  present in the previous release

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.30%. Comparing base (04b86f7) to head (692a3f0).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1171   +/-   ##
=======================================
  Coverage   87.30%   87.30%           
=======================================
  Files          57       57           
  Lines        7706     7706           
  Branches     7706     7706           
=======================================
  Hits         6728     6728           
  Misses        673      673           
  Partials      305      305           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[tsmbland]

If it works it's fine with me!

[Copilot]

Pull request overview

Ensures the scheduled pre-commit-autoupdate GitHub Actions workflow has a Rust toolchain available, since the autoupdate action runs pre-commit after updating hooks and some hooks require Rust tooling.

Changes:

• Add actions-rust-lang/setup-rust-toolchain@v1 to the pre-commit-autoupdate workflow so Rust-dependent hooks can run during the post-update pre-commit execution.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

You can also share your feedback on Copilot code review. Take the survey.