fix: do not prepend full build urls with jenkins base

[Artalus]

fixes #49

[codecov]

Codecov Report

Merging #50 (a6fd209) into master (4fddce8) will increase coverage by 1.82%.
The diff coverage is 71.87%.

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
+ Coverage   16.35%   18.18%   +1.82%     
==========================================
  Files          14       15       +1     
  Lines         434      451      +17     
==========================================
+ Hits           71       82      +11     
- Misses        363      369       +6     

Flag	Coverage Δ
integration	14.85% <25.00%> (+0.57%)	⬆️
unit	15.07% <71.87%> (+1.94%)	⬆️

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Impacted Files	Coverage Δ
src/jenot/__init__.py	54.92% <33.33%> (-7.41%)	⬇️
src/jenot/url.py	86.95% <86.95%> (ø)

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