feat: Add digest field to Artifact

[alexandear]

Fixes #3620

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.33%. Comparing base (bf1d280) to head (c87a7f8).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3621   +/-   ##
=======================================
  Coverage   91.33%   91.33%           
=======================================
  Files         184      184           
  Lines       16174    16174           
=======================================
  Hits        14773    14773           
  Misses       1227     1227           
  Partials      174      174           

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[gmlewis]

Thank you, @alexandear!
LGTM.
Merging.