.gitlab-ci.yml: allow rawhide builds to fail

[junghans]

Part of votca/votca#159

Workaround for openucx/ucx#3558

[codecov]

Codecov Report

Merging #36 into master will increase coverage by 1.4%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master     #36     +/-   ##
========================================
+ Coverage    18.8%   20.3%   +1.4%     
========================================
  Files          10      10             
  Lines        1016    1166    +150     
========================================
+ Hits          192     237     +45     
- Misses        824     929    +105

Flag	Coverage Δ
#clang	15.5% <ø> (ø)	⬆️
#doxygen	33.3% <ø> (?)
#gcc	19.9% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
traj_force/traj_force.h	72.2% <0%> (-27.8%)	⬇️
fluctuations/fluctuations.cc	21.6% <0%> (-0.7%)	⬇️
sphericalorder/sphericalorder.cc	17.1% <0%> (-0.5%)	⬇️
traj_force/traj_force.cc	23.3% <0%> (-0.4%)	⬇️
part_dist/part_dist.cc	22.3% <0%> (-0.2%)	⬇️
partial_rdf/rdf_calculator.cc	3.2% <0%> (-0.1%)	⬇️
radii/radii.cc	25.3% <0%> (+0.3%)	⬆️
orientcorr/orientcorr.cc	22.2% <0%> (+1.2%)	⬆️
partial_rdf/partial_rdf.cc	56.1% <0%> (+5.1%)	⬆️
partial_rdf/rdf_calculator.h	26.5% <0%> (+26.5%)	⬆️

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