docs: public static List<String> extractBaseImages(File dockerFile, FixedStringSearchInterpolator interpolator) throws IOException {
          List<String[]> fromLines = extractLines(dockerFile, "FROM", interpolator);
          LinkedList<String> result = new LinkedList<>();
          for (String[] fromLine :  fromLines) {
              if (fromLine.length > 1) {
                  result.add(fromLine[1]);
              }
          }
          return result;
      }