Add Dockerfile for build env and workflow to build it

[danrmiller]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.89%. Comparing base (b905ad3) to head (633c03e).
⚠️ Report is 1 commits behind head on staging.
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Additional details and impacted files

@@           Coverage Diff            @@
##           staging    #1302   +/-   ##
========================================
  Coverage    74.89%   74.89%           
========================================
  Files           11       11           
  Lines          685      685           
========================================
  Hits           513      513           
  Misses         172      172           

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