ci(deps): auto-approve / auto-merge dependencies from dependabot

[mwbrooks]

Summary

Add a GitHub Actions workflow to auto-approve and auto-merge Dependabot pull requests for patch and minor version updates.

This reduces maintenance burden by automatically handling low-risk dependency updates while still requiring manual review for major version bumps.

Repository Settings Required

To enable auto-merge functionality, the following repository settings must be configured:

• Settings → General → Pull Requests

  • ✅ Allow auto-merge

• Settings → Branches → main branch protection rule

  • ✅ Require status checks to pass before merging
    • Add required checks: Build, Unit Tests

• Settings → Actions → General → Workflow permissions

  • ✅ Allow GitHub Actions to create and approve pull requests

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.54%. Comparing base (6918115) to head (779630c).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@ Coverage Diff @@## main #1434 +/- ##
=======================================
Coverage 90.54% 90.54% =======================================
Files 222 222 Lines 7129 7129 =======================================
Hits 6455 6455 Misses 674 674 

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[zimeg]

LGTM - clean dependabot auto-merge workflow

[mwbrooks]

Thanks @zimeg!

I've confirmed that the repo is configured correctly and has status check requirements for the Linting, Typecheck, and Unit Tests.