Docker build needs a proper healthcheck

[niekcandaele]

Fixes #83

[codecov-io]

Codecov Report

Merging #84 into master will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #84      +/-   ##
==========================================
- Coverage   18.45%   18.41%   -0.04%     
==========================================
  Files         389      390       +1     
  Lines        6195     6206      +11     
==========================================
  Hits         1143     1143              
- Misses       5052     5063      +11     

Impacted Files	Coverage Δ
scripts/healthcheck.js	0.00% <0.00%> (ø)

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[codeclimate]

Code Climate has analyzed commit d833a05 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 0.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 18.4% (0.0% change).

View more on Code Climate.