Markings report fails in non-monorepo style repos

[majgaard]

The way the code below is written causes markings reports to fail for any markings in files which belong to the root package.

markings/packages/cli/src/index.ts

Lines 40 to 54 in cd3b380

	function getPackageFromFilename(
	repoRoot: string,
	filename: string,
	packagesByDirectory: Map<string, Package>
	) {
	let currentDir = nodePath.dirname(filename);
	while (currentDir !== repoRoot) {
	let maybeCurrentPackage = packagesByDirectory.get(currentDir);
	if (maybeCurrentPackage !== undefined) {
	return maybeCurrentPackage;
	}
	currentDir = nodePath.dirname(currentDir);
	}
	throw new Error(`could not find package from ${JSON.stringify(filename)}`);
	}