Fishtest runs out of disk space due to apparent caching of old tests

[formal atlas]

I started running fishtest in little VM's with disk spaces of < 4GB. After running for a few days the workers run out of disk space due to the testing directory ballooning with stuff. Is there a way to disable this/mitigate it so I don't have to keep clearning it out? i could set up a cron job, but that's hacky, I am asking about a nice, clean way to prevent fishtest using too much disk.

running debian 12

[plain yoke]

fishtest keeps up to 50 Stockfish binaries in testing directory. You can modify the script (games.py) and lower the limit.