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> because docker build does not allow you to temporarily mount the cached dependencies.

Why do you believe this point is relevant? If you can mount a drive then you can access its contents on the host, and if you can access files on the host then those contents are also accessible in a Docker build.

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You CAN NOT mount a drive with "docker build". You CAN however mount a drive with "docker run". So therefore: Dockerfile = docker run + docker commit + MANY unneeded limitations

> You CAN NOT mount a drive with "docker build".

No one said that. I stated the fact that you can access files from the host during a docker build, thus it's irrelevant if you can mount drives or not. Just copy the files into your build stage and that's it.

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