extensions/github/src/pushErrorHandler.ts/findMarkdownFilesInDir
async function findMarkdownFilesInDir(uri: Uri): Promise<Uri[]> {
	const files = await workspace.fs.readDirectory(uri);
	return files
		.filter(([name, type]) => Boolean(type & FileType.File) && path.extname(name) === '.md')
		.map(([name]) => Uri.joinPath(uri, name));
}