Feature/better clear docker cache
What does this MR do?
Improve error handling and shell scripting in the
clear-docker-cache shell script
Why was this MR needed?
As a user, when running this command in a crontab, I want to see verbose error output when debugging.
xargs to remove the docker images is cleaner than storing the list of images in a string and then checking if that string is empty or not.
What's the best way to test this MR?
You can test this script by turning docker on/off on your host machine and viewing the error/success messages.