async function addNewChangelog(prNumber, category, content) {
  const file = new URL(
    `../changelog_unreleased/${category}/${prNumber}.md`,
    import.meta.url,
  );
  await fs.writeFile(file, content);
  return file;
}
@param {number} prNumber
@param {string} category
@param {string} content
@returns {Promise<URL>}