Images are so big that folks are running out of disk space

[kdmccormick]

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[kdmccormick]

(@connorhaugh and @zhancock)

[kdmccormick]

So, I have indeed been running out of disk space every couple of months. I believe it's because I'm using a mixture of tutor stable, tutor nightly, and devstack, and I'm constantly building new images to test things out. This fills up my Docker image build cache over time. Fortunately I don't think the average tutor user will hit this issue as often.

A few things that can be done to mitigate the issue:

1. Add guidance about Docker resource pruning to the official docs: https://github.com/overhangio/2u-tutor-adoption/issues/126
2. Profile the Docker image to look for build optimizations: https://github.com/overhangio/2u-tutor-adoption/issues/118
3. Reduce the size of the MFE image: Discovery: Bundle size is a blocker to builds openedx/wg-frontend#140

Since each of those things has an associated issue, I'll close this issue. FYI @regisb .