implement registration token secret

[davidkarlsen]

Fixes #150.

[codecov]

Codecov Report

Merging #151 (c132c0c) into master (2975590) will decrease coverage by 2.42%.
The diff coverage is 52.46%.

@@            Coverage Diff             @@
##           master     #151      +/-   ##
==========================================
- Coverage   62.00%   59.59%   -2.41%     
==========================================
  Files           2        2              
  Lines         150      193      +43     
==========================================
+ Hits           93      115      +22     
- Misses         43       58      +15     
- Partials       14       20       +6     

Impacted Files	Coverage Δ
controllers/githubactionrunner_controller.go	53.02% <52.46%> (-0.64%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2975590...c132c0c. Read the comment docs.