Depot machines don’t run inside your org - they’re fully managed by Depot. However, we’ll be introducing a CLI flag to allow you to clear your cache. Larger cache sizes will be available soon as well.
That said, it looks like your Dockerfile is using COPY --link. Using --link triggers an upstream bug in Buildkit which can fill up your cache quickly. If you remove --link from your Dockerfile, that will likely help.
Also, I’ve gone ahead and reset your cache on both of your organizations.