Add docker image

[ruairif]

No description provided.

[codecov]

Codecov Report

Merging #283 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #283   +/-   ##
=======================================
  Coverage   68.37%   68.37%           
=======================================
  Files          16       16           
  Lines         819      819           
  Branches       96       96           
=======================================
  Hits          560      560           
  Misses        230      230           
  Partials       29       29

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[jpmckinney]

You are welcome to maintain a Docker image independently.

To keep maintenance burden low, we don't include such packaging.

[jpmckinney]

Done in ee4e036. Related: #234