Soliciting ideas to reduce size of Docker image

[tlkh]

Is your feature request related to a problem? Please describe.

We've already brought down the size of our Docker image from 7GB+ to 5GB+ (this is the compressed image size as reported by Docker Hub) by eliminating redundant file operations, merging layers etc. etc.

However, we're still on the lookout for ideas on how we can make the image smaller.

Describe alternatives you've considered

We based the container on the devel version of the CUDA container, so that adds almost 1GB to the image size. We'd like to take that out, but we need to compile RAPIDS, and we haven't gotten a multi-stage build to work yet.