ci: fix missing toolchain input in release publish job

[27Bslash6]

Summary

• The dtolnay/rust-toolchain action in the publish job was SHA-pinned but missing the required toolchain: stable input
• This caused the v0.3.0 publish to fail immediately: 'toolchain' is a required input

Fix

Add with: toolchain: stable to the step.

After merging, re-run the failed publish job or manually cargo publish.

Summary by CodeRabbit

• Chores
  • Improved CI build workflow: isolated artifact storage and a streamlined Rust toolchain setup for more reliable, more consistent builds.

[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: 01bd6dec-0765-43dd-939a-29ab7ed4eb3f

📥 Commits

Reviewing files that changed from the base of the PR and between 7acec7c and 02d02f9.

📒 Files selected for processing (1)

• .github/workflows/release.yml

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📝 Walkthrough

Walkthrough

Publish job in the GitHub Actions workflow was modified: it now runs on cachekit-lean, removes the dtolnay/rust-toolchain and Swatinem/rust-cache actions, sets RUSTUP_HOME and CARGO_HOME under /tmp, and installs the stable Rust toolchain via inline rustup commands (minimal profile, set default). Tests/publish steps unchanged.

Changes

Cohort / File(s)	Summary
GitHub Workflow ​.github/workflows/release.yml	Publish job updated to run on cachekit-lean; removed dtolnay/rust-toolchain and Swatinem/rust-cache action usages; added env vars RUSTUP_HOME/CARGO_HOME pointing to /tmp; added inline rustup commands to install stable (minimal) and set it as default. Tests/publish step logic preserved.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 In cachekit-lean I hop and cheer,
Rustup in /tmp makes artifacts clear.
Stable installed, set as the way,
Builds stay tidy — huzzah, hooray! 🥕✨

🚥 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 'ci: fix missing toolchain input in release publish job' accurately describes the main change—adding the missing toolchain input to the release workflow.
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 fix/release-workflow-toolchain

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