/var/tmp/ full of 'container_images_storageXXXXX*

Hiya,
This keeps happening to me and I know what is happening. Basically I'll get a KDE notification about "You are running out of disk space", much like this GH repo [You are running out of disk space] (https://github.com/actions/runner-images/issues/2840). So I check /var/temp/ and its filled with loads of folders called: container_images_storageXXXXX, the X's being numbers. Each folder has three files: named "1", "2" and "3". After a while, maybe 20 mins, the files are removed by themselves somehow.
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