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Dockerfile: optimize layer caching

Piotr Kira requested to merge optimize_dockerfile into master

The main optimization is that docker image doesn't have to reinstall all of the apt/pip dependencies after each code change. Other benefits that are result of layer caching include:

  • faster builds (not as important for release builds, I guess we use no-cache option anyway but it's important for local testing/building)
  • faster deployments (not as many layers are needed to download)

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