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Clean up excessive docker usage

Ran into an issue today where the /var/lib/docker folder had grown to a full 45gb of size. After some futher inspection, it turned out to be the overlay2 and the volumes folder that were large.

Since this was a CI server (a server that runs build pipelines), no data needed to be persisted there. This allowed me to clean it up using the following commands:

docker system prune -a -f cleaned out the overlay2 folder docker volume rm $(docker volume ls -qf dangling=true) cleaned out the volumes folder

After this, the /var/lib/docker folder was only 3mb large.