Scheduled Docker cleanup: Exclude certain images

[alvarolozano]

I use coolify for an small server, and it easilly becomes full of storage. For that reason, I enabled the scheduled docker cleanup option.

The only problem, is that it removes some "internal" images/layers. The main one, is the nixpack build container images, so every day, it cleans it, and when triggering a new buid, it re-downloads and compiles the nix images and packages from scratch, and also the cache mount for PNPM gets removed.

I don't really understand how the process is triggered, but Docker prune has advanced options for excluding https://docs.docker.com/reference/cli/docker/image/prune/#filter