[WIP] Start end time for challenges

[Abdulwahaab710]

No description provided.

[codecov]

Codecov Report

Merging #92 into master will increase coverage by 0.66%.
The diff coverage is 82.35%.

@@            Coverage Diff             @@
##           master      #92      +/-   ##
==========================================
+ Coverage   74.17%   74.84%   +0.66%     
==========================================
  Files          37       38       +1     
  Lines         453      469      +16     
==========================================
+ Hits          336      351      +15     
- Misses        117      118       +1

Impacted Files	Coverage Δ
app/jobs/activate_challenges_job.rb	100% <100%> (ø)
app/models/challenge.rb	100% <100%> (ø)	⬆️
app/controllers/ctf_settings_controller.rb	50% <40%> (-3.34%)	⬇️
app/jobs/application_job.rb	100% <0%> (+100%)	⬆️

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