Publish docker image to ghcr

[dalager]

• Build as docker file for easier execution
• Push to ghcr.io/dalager/graphedexcel

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.06%. Comparing base (8fd40f8) to head (543fdef).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #44   +/-   ##
=======================================
  Coverage   91.06%   91.06%           
=======================================
  Files           7        7           
  Lines         291      291           
=======================================
  Hits          265      265           
  Misses         26       26           

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