feat: ci: Add PR title check workflow

[rjan90]

Related Issues

Closes: #12148

Proposed Changes

A GitHub Actions workflow to automatically check and enforce a consistent format for PR titles.

Key features of the PR title check workflow:

1. Runs on pull request events (opened, edited, synchronize, reopened)
2. Supported types: feat, fix, docs, style, refactor, test, chore
3. Provides feedback via PR comments for non-compliant titles

This workflow will help maintain consistency in our commit history and make it easier to generate meaningful changelogs automatically.

Testing:

• Create a PR with a valid title format (e.g., "feat: add new feature")
• Create a PR with an invalid title format and verify that it's blocked
• Edit a PR title from invalid to valid format and confirm the check passes
• Verify that appropriate comments are added for non-compliant titles

Checklist

Before you mark the PR ready for review, please make sure that:

• Commits have a clear commit message.
• PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, build, chore, ci, docs, perf, refactor, revert, style, test
  • area, e.g. api, chain, state, mempool, multisig, networking, paych, proving, sealing, wallet, deps
• Update CHANGELOG.md or signal that this change does not need it.
  • If the PR affects users (e.g., new feature, bug fix, system requirements change), update the CHANGELOG.md and add details to the UNRELEASED section.
  • If the change does not require a CHANGELOG.md entry, do one of the following:
    • Add [skip changelog] to the PR title
    • Add the label skip/changelog to the PR
• New features have usage guidelines and / or documentation updates in
  • Lotus Documentation
  • Discussion Tutorials
• Tests exist for new functionality or change in behavior
• CI is green

[github-actions]

Your PR title does not match the required format. Please update it to follow this convention: <type>: <scope>: <subject>

Types: feat, fix, docs, style, refactor, test, chore
Scope: required
Subject: start with lowercase

[github-actions]

Please update the PR title to match the required format.

[rjan90]

Create a PR with an invalid title format and verify that it's blocked

Confirmed that when using an invalid title format: "Add PR title check workflow" - GHA commented that the format does not match the required format. It also requested changes to the PR title to match the required format.

[rjan90]

Seems like it's was not able to remove the "requested changes" after updating the PR-title. I have added the logic here 56fbbf6 - will close this PR - and re-open to test out this change.