creating new pymarlin docker

[jsleep]

creating a new dockerfile with planned backend extensions #70

[codecov]

Codecov Report

Merging #73 (8e924c6) into main (857e3e9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #73   +/-   ##
=======================================
  Coverage   75.21%   75.21%           
=======================================
  Files          20       20           
  Lines        1368     1368           
=======================================
  Hits         1029     1029           
  Misses        339      339           

Flag	Coverage Δ
unittests	75.21% <ø> (ø)

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