CLI: add human-readable error when [build] script exits with 1

[chicoxyzzy]

No description provided.

[chicoxyzzy]

How about this?

Old:

New:

[chicoxyzzy]

I'll save my code here:

String wrapInASCIIBox(const String& text) {
  Vector<String> lines;
  std::istringstream iss(text);
  String line;

  size_t max_length = 0;
  while (std::getline(iss, line)) {
    lines.push_back(line);
    if (line.size() > max_length) {
      max_length = line.size();
    }
  }

  String topBottomBorder = "+" + String(max_length + 2, '-') + "+";
  String result = topBottomBorder + "\n";

  for (const auto& l : lines) {
    result += "| " + l + String(max_length - l.size(), ' ') + " |\n";
  }

  result += topBottomBorder + "\n";
  return result;
}