[GitHub] KellenSunderland opened a new pull request #11302: [MXNET-553] Restructure dockcross dockerfiles to fix caching

[GitBox <gi...@apache.org>]

KellenSunderland opened a new pull request #11302: [MXNET-553] Restructure dockcross dockerfiles to fix caching
URL: https://github.com/apache/incubator-mxnet/pull/11302
 
 
   ## Description ##
   This PR restructures the dockcross Dockerfiles to remove their multi-head components.  This multi-head component made it difficult to properly provide a remote cache for the Dockerfiles, and was slowing down builds.   A simple work-around for this was to generalize the ubuntu_ccache.sh file such that it works with ubuntu, debian, and in cross-compilation containers.  We can now use this script the same way in a variety of containers, which eliminates the need for a special multi-head docker stage.
   
   ## Checklist ##
   ### Essentials ###
   Please feel free to remove inapplicable items for your PR.
   - [x] The PR title starts with [MXNET-$JIRA_ID], where $JIRA_ID refers to the relevant [JIRA issue](https://issues.apache.org/jira/projects/MXNET/issues) created (except PRs with tiny changes)
   - [x] Changes are complete (i.e. I finished coding on this PR)
   - x] All changes have test coverage:
   - Ran test_docker_cache.py, ensured both existing tests pass.
   - [x] Code is well-documented: 
   - [x] To the my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change
   

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