Check auto-merge commit title

[AlekSi]

github-actions/conform-pr/main.go

Lines 323 to 335 in 0d831dd

	// checkAutoMerge checks if PR's auto-merge is enabled.
	func checkAutoMerge(_ *githubactions.Action, pr *graphql.PullRequest, community bool) error {
	if pr.Closed || pr.AutoMerge {
	return nil
	}
	msg := `PR should have auto-merge enabled.`
	if community {
	msg += ` Don't worry, maintainers will enable it for you.`
	}
	return errors.New(msg)
	}

conform-pr's auto-merge checker should check that the commit_title property matches PR's subject number plus the PR number with # and brackets. That is to ensure that auto-merge generates the right commit subject line after the PR title is edited.