message: Refactor to use optional string
diff: @@ -147,8 +147,8 @@ export class DocsBuilder {
  argv: process.argv,
  logger: getRootLogger(),
  });
  - const workingDir = config.get('backend.workingDirectory');
  - const tmpdirPath = workingDir ? String(workingDir) : os.tmpdir();
  + const workingDir = config.getOptionalString('backend.workingDirectory');
  + const tmpdirPath = workingDir || os.tmpdir();
  // Fixes a problem with macOS returning a path that is a symlink
  const tmpdirResolvedPath = fs.realpathSync(tmpdirPath);
  const outputDir = await fs.mkdtemp(
  