Auto-generated merge commit is causing the GitHub Action failing

[SiegeSailor]

Describe the bug

I resolved a merge conflict by committing on the GitHub Web UI, which creates a commit with the following message:

Merge branch 'main' into release
    
Signed-off-by: Jin Yu Zhang <39463416+SiegeSailor@users.noreply.github.com>

However, the GitHub Action commitlint reports Commit message does not follow the Conventional Commits format for such a commit message:

• pull_request with the synchronize event type:
  • commitlint pulls out all the commit messages and therefore reports the error message every time
  • see https://github.com/SiegeSailor/Smarty-Notebook/actions/runs/19212728519/job/54917412427
• push
  • commitlint only validates the current commit message, so only the action triggered by the merge commit reports the error message
  • See https://github.com/SiegeSailor/Smarty-Notebook/actions/runs/19205599978/job/54900288644 for the failed case
  • See https://github.com/SiegeSailor/Smarty-Notebook/actions/runs/19212728100/job/54917411463 for the successful case

To Reproduce

Create a merge commit on the GitHub UI.

Expected behavior

commitlint ignores the auto-generated merge commits.

Environment

• Operating system: ubuntu-latest

Additional Context

commitlint (1.3.1) doesn't report any error when I run it locally:

commitlint "Merge branch 'main' into release\nSigned-off-by: Jin Yu Zhang <39463416+SiegeSailor@users.noreply.github.com>"
Commit validation: successful!

commitlint "Merge branch 'main' into release"
Commit validation: successful!

[aj3sh]

Thanks @SiegeSailor for reporting the issue. We will look into it 🙂.

[aj3sh]

I have replicated the issue on my local machine. Seems like the commit message isn't being ignored.