KellenSunderland opened a new pull request #12270: [MXNET-848] Pin dockcross 
base images to known working versions
URL: https://github.com/apache/incubator-mxnet/pull/12270
 
 
   ## Description ##
   This PR will pin our dockcross base images to known working versions.  
Pinning these images is necessary as we've had cases where following the 
'latest' tag in dockerhub leads us to picking up broken, or incompatible 
images.  Though the dockcross images are generally high-quality we'd like to 
avoid these issues from blocking our CI in the future.
   
   The disadvantage here is that we will lose visibility in valid failures for 
things like new cmake versions that potentially break on ARM builds.  We feel 
that these test should be done independently of PR validation, and would be 
best suited for the nightly test runs.
   
   ## Checklist ##
   ### Essentials ###
   Please feel free to remove inapplicable items for your PR.
   - [x] The PR title starts with [MXNET-$JIRA_ID], where $JIRA_ID refers to 
the relevant [JIRA issue](https://issues.apache.org/jira/projects/MXNET/issues) 
created (except PRs with tiny changes)
   - [x] Changes are complete (i.e. I finished coding on this PR)
   - [x] All changes have test coverage:
   - Unit tests are added for small changes to verify correctness (e.g. adding 
a new operator)
   - Nightly tests are added for complicated/long-running ones (e.g. changing 
distributed kvstore)
   - Build tests will be added for build configuration changes (e.g. adding a 
new build option with NCCL)
   - [x] Code is well-documented: 
   - For user-facing API changes, API doc string has been updated. 
   - For new C++ functions in header files, their functionalities and arguments 
are documented. 
   - For new examples, README.md is added to explain the what the example does, 
the source of the dataset, expected performance on test set and reference to 
the original paper if applicable
   - Check the API doc at 
http://mxnet-ci-doc.s3-accelerate.dualstack.amazonaws.com/PR-$PR_ID/$BUILD_ID/index.html
   - [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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