I've got a Mac Mini running as a CI/CD server; it's a game project, and every time we push a change to the repo, the server creates a build & uploads it to TestFlight.
I've noticed that after running the server for around a week or so, the main drive is getting filled to the point of the machine becoming unresponsive (and our builds failing). After some investigation, I've determined that /private/var/folders/ is getting filled up with... something, related to the Xcode build/archive. It seems like we absolutely do not need this information, so I've periodically run rm -rf /private/var/folders/* to clean it out – some folders are permission-protected, but regardless, I'm able to recover >100GB with this method.
Although this workaround does suffice, I'm just wondering what kinds of files Xcode is creating here, and whether there's a cleaner/best-practice method to remove them.