Allow cancel of queued job

[hlubek]

Fixes #40

[Sebobo]

Looks good by reading, from my not existing Go knowledge :)

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.35 🎉

Comparison is base (4863774) 70.68% compared to head (3642685) 71.03%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
+ Coverage   70.68%   71.03%   +0.35%     
==========================================
  Files          20       20              
  Lines        2180     2196      +16     
==========================================
+ Hits         1541     1560      +19     
+ Misses        519      517       -2     
+ Partials      120      119       -1     

Impacted Files	Coverage Δ
prunner.go	81.65% <100.00%> (+0.73%)	⬆️

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[hlubek]

Looks good by reading, from my not existing Go knowledge :)

TIL concurrency is still hard...

Good that the race detector and coverage (???) showed some flaws - which was not only the test code. It should work based on the tests and some experiments locally with the UI (which also needs a small PR), so I'd draft a release candidate that we could test.