message: Add brackets to nightlyl var
diff: @@ -79,7 +79,7 @@ if [ -n "${pkg-}" ]; then
  yarn_script="$yarn_script-$pkg"
  fi
  -if [ -n "$nightly-" ]; then
  +if [ -n "${nightly-}" ]; then
  yarn_script="$yarn_script-nightly"
  elif [ -n "${headless-}" ]; then
  yarn_script="$yarn_script-headless"
  