title: Docker doesn't have permission to execute bash file
body: <p>I have followed a guide to dockerise an Elixir/Phoenix project and I created a bash script, but docker doesn't have permssion to execute the file. I ran </p>
  
  <pre><code>docker-compose build
  chmod u+x entrypoint.sh 
  docker-compose up
  </code></pre>
  
  <p>despite running the commands it still doesn't have permission. What am I doing wrong?</p>