Add Dockerfile

[alejo-rivera]

A simple two stage Dockerfile for building a container image.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.68%. Comparing base (7bba760) to head (c6f6f5a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #106   +/-   ##
=======================================
  Coverage   90.68%   90.68%           
=======================================
  Files           9        9           
  Lines         580      580           
  Branches       90       90           
=======================================
  Hits          526      526           
  Misses         53       53           
  Partials        1        1           

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