install cloc, fix cloc-script when run in docker

Dockerfile

 FROM openjdk:11
 
 ENV DEBIAN_FRONTEND noninteractive
-RUN apt-get update && apt-get install -y graphviz && rm -rf /var/lib/apt/lists/*
+RUN apt-get update && apt-get install -y graphviz cloc && rm -rf /var/lib/apt/lists/*
 
 ENV HOME /home/user
 RUN useradd --create-home --home-dir $HOME user \

cloc/run-cloc.sh

-#!/usr/bin/bash
+#!/bin/bash
 shopt -s globstar
 
 if [ ]
@@ -7,7 +7,7 @@ then
 else
 
 # remove previous results
-rm *-result.txt
+rm -f *-result.txt
 
 #  --force-lang=Java,jrag --force-lang=Java,jadd
 DEF_FILE=my_definitions.txt