ci: add zizmor GitHub Actions security lint

[robjtede]

Adds zizmor security analysis to the existing lint workflow. The job uses read-only permissions, disables checkout credential persistence, and emits GitHub annotations without uploading SARIF to Advanced Security.

Summary by CodeRabbit

• Chores
  • Added automated security checks for workflow configurations, with clearer annotations for detected issues.
  • Improved release automation by applying more restrictive permissions and safer credential handling.
  • Added a seven-day waiting period for grouped dependency updates to allow issues to be identified before changes are applied.
  • Removed automatic dependency pull request processing to support additional review of updates.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a4c2b444-415f-4b4d-bbb8-ff2fb7e4d132

📥 Commits

Reviewing files that changed from the base of the PR and between 6b08f7a and 11b40e7.

📒 Files selected for processing (1)

• .github/workflows/release.yml

📝 Walkthrough

Walkthrough

The changes add workflow security linting, scope release permissions, disable persisted checkout credentials, pass release data through environment variables, and add seven-day Dependabot cooldowns. The Dependabot auto-merge workflow is also removed.

Changes

Workflow security and update controls

Layer / File(s)	Summary
Add workflow security checks .github/workflows/lint.yml	The lint workflow adds a pinned zizmor job with read-only permissions and annotations.
Scope release workflow permissions .github/workflows/release.yml	Release jobs now use job-specific permissions, disable persisted checkout credentials, and pass release metadata through environment variables.
Configure dependency update timing .github/dependabot.yml, .github/workflows/dependabot.yml	Dependabot adds seven-day cooldowns for GitHub Actions, Nix, and Cargo updates. The Dependabot auto-merge workflow is removed.

Estimated code review effort: 3 (Moderate) | ~20 minutes

🚥 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 clearly and concisely describes the main change: adding zizmor security linting to GitHub Actions.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/add-zizmor-lint

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[coderabbitai]

🧹 Nitpick comments (1)

.github/workflows/release.yml (1)

15-18: 🔒 Security & Privacy | 🔵 Trivial | ⚡ Quick win

Add a default-deny workflow permission baseline.

The patch scopes the current jobs, but it removes the workflow-level permission block. Add permissions: {} at workflow scope so future jobs do not inherit the repository default. GitHub supports an empty permission map for this purpose. (docs.github.com)

Proposed hardening

 on:
   push:
     branches: [main]
 
+permissions: {}
+
 jobs:

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In @.github/workflows/release.yml around lines 15 - 18, Add a workflow-level
permissions baseline in release.yml by setting permissions to an empty map
alongside the top-level workflow configuration, while preserving the existing
job-level permissions for required access.

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Nitpick comments:
In @.github/workflows/release.yml:
- Around line 15-18: Add a workflow-level permissions baseline in release.yml by
setting permissions to an empty map alongside the top-level workflow
configuration, while preserving the existing job-level permissions for required
access.

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 01a9db8d-57a2-4bcd-9fa6-4adbf76af824

📥 Commits

Reviewing files that changed from the base of the PR and between 138404c and 6b08f7a.

📒 Files selected for processing (3)

• .github/dependabot.yml
• .github/workflows/dependabot.yml
• .github/workflows/release.yml

💤 Files with no reviewable changes (1)

• .github/workflows/dependabot.yml