ההתקנה של Discourse נכשלת כאשר pups מנסה ליצור קישור סמלי

The error stems from attempting to create symlinks for log files, but files with those names already exist

Before running discourse-setup, remove files like production.log, production_errors.log, etc. in /var/www/discourse/log. This allows the symlink commands to succeed.
Example:

rm /var/www/discourse/log/production.log
rm /var/www/discourse/log/production_errors.log
rm /var/www/discourse/log/unicorn.stdout.log
rm /var/www/discourse/log/unicorn.stderr.log
rm /var/www/discourse/log/sidekiq.log

Then, re-run the setup.

Also, The file/folder ownership inside the container should typically be for the discourse user, not root or your host user. If files are pre-created on the host by the wrong user or with incorrect permissions, setup may fail.