drop obsolete code - no need for field indexer any longer

[davidkarlsen]

No description provided.

[codecov]

Codecov Report

Merging #152 (4eee3b4) into master (d0fbbaa) will increase coverage by 1.59%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #152      +/-   ##
==========================================
+ Coverage   59.59%   61.18%   +1.59%     
==========================================
  Files           2        2              
  Lines         193      188       -5     
==========================================
  Hits          115      115              
+ Misses         58       53       -5     
  Partials       20       20              

Impacted Files	Coverage Δ
controllers/githubactionrunner_controller.go	54.66% <ø> (+1.65%)	⬆️

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