[request]: Allow multi-stage docker building in notebook dockerfiles

[din14970]

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Tell us about your request In a regular conveyor build, one can use buildkit and therefore also builder images, see https://docs.docker.com/develop/develop-images/multistage-build/

However, in notebook dockerfiles this doesn't seem to work. A reason to do this is reduce the layers and therefore size of docker images.

Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?

Are you currently working around this issue? Put everything in the a single stage build

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[pascal-knapen]

@din14970 Let us have a look at what we can do about this