fix: preserve existing config in `configure()` #111

	---
	name: PR formatting

	on:
	pull_request_target:
	types:
	- opened
	- edited
	- synchronize

	jobs:
	validate-title:
	name: Validate PR title
	runs-on: ubuntu-latest
	permissions:
	pull-requests: read
	steps:
	- uses: amannn/action-semantic-pull-request@v6
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

	apply-label:
	name: Apply label from PR title
	runs-on: ubuntu-latest
	needs: validate-title
	permissions:
	pull-requests: write
	steps:
	- uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
	with:
	script: \|
	const title = context.payload.pull_request.title;

	const mapping = [
	{ pattern: /^(feat\|feat!)($.+$)?!?:/, label: "enhancement" },
	{ pattern: /^perf($.+$)?:/, label: "enhancement" },
	{ pattern: /^(fix\|fix!)($.+$)?!?:/, label: "bug" },
	{ pattern: /^docs($.+$)?:/, label: "documentation" },
	{ pattern: /^(chore\|build\|ci\|style\|test\|refactor)($.+$)?:/, label: "maintenance" },
	];

	// Check for breaking change: trailing ! before colon or BREAKING CHANGE in body
	const isBreaking = /^[a-z]+($.+$)?!:/.test(title);
	if (isBreaking) {
	await github.rest.issues.addLabels({
	owner: context.repo.owner,
	repo: context.repo.repo,
	issue_number: context.payload.pull_request.number,
	labels: ["breaking"],
	});
	return;
	}

	for (const { pattern, label } of mapping) {
	if (pattern.test(title)) {
	await github.rest.issues.addLabels({
	owner: context.repo.owner,
	repo: context.repo.repo,
	issue_number: context.payload.pull_request.number,
	labels: [label],
	});
	return;
	}
	}

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