Test image

[gdubicki]

We should start testing the Docker image that we build, to prevent issues like #701.

[codecov]

Codecov Report

Merging #703 (9cc74aa) into master (9cc74aa) will not change coverage.
The diff coverage is n/a.

❗ Current head 9cc74aa differs from pull request most recent head c6424a4. Consider uploading reports for the commit c6424a4 to get more accurate results

@@           Coverage Diff           @@
##           master     #703   +/-   ##
=======================================
  Coverage   85.91%   85.91%           
=======================================
  Files          19       19           
  Lines        1051     1051           
=======================================
  Hits          903      903           
  Misses        148      148           

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