docs: public static List<String[]> extractLines(File dockerFile, String keyword, FixedStringSearchInterpolator interpolator) throws IOException {
          List<String[]> ret = new ArrayList<>();
          try (BufferedReader reader = new BufferedReader(new FileReader(dockerFile))) {
              String line;
              while ((line = reader.readLine()) != null) {
                  String lineInterpolated = interpolator.interpolate(line);
                  String[] lineParts = lineInterpolated.split("\\s+");
                  if (lineParts.length > 0 && lineParts[0].equalsIgnoreCase(keyword)) {
                      ret.add(lineParts);
                  }
              }
          }
          return ret;
      }