Prune image from GPU agent disk. (#1088)
Prune image from GPU agent disk. (#1088)

* Prune image from GPU agent disk.

It was currently only running on the CPU (ephemeral) agents. 
Switched to be run on the GPU agent building the image to prevent build errors caused by disk filling up.

* Reduce prune window
Kaggle/docker-python,Kaggle/docker-python