Automated testing of REST API

[krestenlaust]

This PR aims to implement automating testing using example data in the API spec.

Plan:

• Fix inconsistencies in api spec to be parsable by Dredd
• Create Stregsystem fixture based on examples in api spec
• Correct potential errors discovered
• Create github workflow that runs Dredd automatically on PRs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.81%. Comparing base (a02bfdb) to head (59549f9).
Report is 6 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #550      +/-   ##
==========================================
+ Coverage   80.80%   80.81%   +0.01%     
==========================================
  Files          40       40              
  Lines        3809     3811       +2     
  Branches      481      481              
==========================================
+ Hits         3078     3080       +2     
  Misses        675      675              
  Partials       56       56              

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[Mast3rwaf1z]

most of the comments i'm fine with just a reply, but there's some small things with the code i'd like to be considered

generally i think we should clean up the project root, and another file (dredd.yml) doesn't help

[Mast3rwaf1z]

lgtm, works on my machine 👍