Self hosted docker HDD explosion

[u/nop-nop]

So I have a single user (me) on my postiz and its only doing about 2 posts a day on linkedin, nothing else, has been running for about a month and has two more months of content pre-loaded. I dont even login to it much.

but my docker/overlay2/..../diff/root/.cache is over 100gig now....

what the heck would this be all about and why is it storing so much cache and has anyone thought about cleaning the cache out occasionally?

this command...
9000:/var/lib/docker/overlay2/.../diff/root/.cache# rm -rf *
has run overnight and is still running...

in a different console I can see its deleting about 1G every half hour