Add /job_groups/id/build_results API route

[perlpunk]

Issue: https://progress.opensuse.org/issues/152939

I moved _map_tags_into_build into the compute_build_results() function.

The command lime to get the last "published" build would look like this:

    openqa-cli api job_groups/1/build_results only_tagged=1 limit_builds=1 \
      | jq -r '[.build_results[] | select(.tag.description=="published") | select(.version=="Tumbleweed") | .build ][0]'

To only get the latest build:

    openqa-cli api job_groups/1/build_results  limit_builds=1| jq -r '[.build_results[] | .build ][0]'

Only normal groups are supported, not parent groups, to keep it simple. I can go though our logs to see if the group_overview.json is ever called for parent groups.

I am seeing a problem with the documentation display of the new function when getting a 404. The documentation for the new function is displayed for +/job_groups/<group_id:num>/jobs GET as well as +/job_groups/<group_id:num>/build_results.
Maybe a bug in how Mojolicious renders the pod. I can't see anything wrong there.

Also I found a misdocumented route. I will open a seperate PR.

Still need to document this somewhere.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8c66280) 98.37% compared to head (2dd03be) 98.38%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5433   +/-   ##
=======================================
  Coverage   98.37%   98.38%           
=======================================
  Files         389      389           
  Lines       37769    37827   +58     
=======================================
+ Hits        37157    37215   +58     
  Misses        612      612           

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[okurz]

+1

[Martchus]

openqa-cli api job_groups/1/build_results | jq -r '[.build_results[] | .build ][0]'

So the limit_builds parameter is not supported (as on the UI route like this: https://openqa.suse.de/group_overview/110?limit_builds=1)? It would make sense to support the same set of parameters:

openqa-cli api job_groups/1/build_results?limit_builds=1

EDIT: Looks like this would actually already work.

[perlpunk]

openqa-cli api job_groups/1/build_results?limit_builds=1

EDIT: Looks like this would actually already work.

I edited the commit message to include limit_builds