Github-app auth-mode

[davidkarlsen]

Fixes #75. Allow operator to authenticate as github-app. This eliminates the need to use PATs per pool, while still being compatible with the existing PAT-mode.

[codecov]

Codecov Report

Merging #153 (a984e8e) into master (fa9402e) will decrease coverage by 0.04%.
The diff coverage is 38.89%.

@@            Coverage Diff             @@
##           master     #153      +/-   ##
==========================================
- Coverage   61.18%   61.14%   -0.03%     
==========================================
  Files           2        2              
  Lines         188      193       +5     
==========================================
+ Hits          115      118       +3     
- Misses         53       55       +2     
  Partials       20       20              

Impacted Files	Coverage Δ
controllers/githubactionrunner_controller.go	54.82% <38.89%> (+0.17%)	⬆️

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