4. Squash Docker image layers? This approach requires additional tool (https://github.com/jwilder/docker-squash requires sudo) and understanding of what layers to squash and what layers to keep as is (for optimization of Docker image delivery - some base layers are taken from image vendor and are not changed, so I need to keep them to avoid re-delivering of the whole Docker image). I'm not sure about impact of squashing of Docker layers on Docker build cache and on the whole time required for building (if TAR checksum didn't change then rebuilding of Docker image is faster due to Docker build cache).
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