WIP: Use Kaniko layer caching instead of two Docker images

Open Viacheslav Ostroukh requested to merge enh/kaniko_caching into master

This will simplify configuration and speed up builds.

Currently (kaniko 1.3.0) there is a failure on unpacking layers: conda claims that its root environment is corrupted. Need to try ou t this configuration upon releases of newer kaniko or investigate further.

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