Docker environment for developing on the package itself

[isc-pbarton]

Resolves #723

I think no changelog needed as the only audience is contributors to this project.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.97%. Comparing base (896874c) to head (0089fe3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #933   +/-   ##
=======================================
  Coverage   50.97%   50.97%           
=======================================
  Files          23       23           
  Lines        3131     3131           
=======================================
  Hits         1596     1596           
  Misses       1535     1535           

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