Add a feature to run existing, but stopped containers

[thatside]

Just added some ifs to run-job module. Based on @WoLfulus updated build config (#41).

[codecov]

Codecov Report

Merging #42 into master will decrease coverage by 0.8%.
The diff coverage is 30%.

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
- Coverage   70.69%   69.89%   -0.81%     
==========================================
  Files          15       15              
  Lines         720      734      +14     
==========================================
+ Hits          509      513       +4     
- Misses        157      167      +10     
  Partials       54       54

Impacted Files	Coverage Δ
core/runjob.go	59.55% <30%> (-5.79%)	⬇️

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