CI: do not build for master

[junghans]

No description provided.

[codecov]

Codecov Report

Merging #561 into master will increase coverage by 5.4%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master    #561     +/-   ##
========================================
+ Coverage    22.6%   28.1%   +5.4%     
========================================
  Files         124     124             
  Lines        7616    7622      +6     
========================================
+ Hits         1725    2143    +418     
+ Misses       5891    5479    -412     

Impacted Files	Coverage Δ
src/libcsg/nblist.cc	81.0% <0.0%> (-7.2%)	⬇️
src/libcsg/imcio.cc	81.6% <0.0%> (-1.0%)	⬇️
src/tools/csg_reupdate.cc	88.6% <0.0%> (-0.6%)	⬇️
include/votca/csg/topology.h	5.6% <0.0%> (+1.4%)	⬆️
src/tools/csg_resample.cc	54.2% <0.0%> (+1.4%)	⬆️
include/votca/csg/exclusionlist.h	31.8% <0.0%> (+1.4%)	⬆️
src/libcsg/nblistgrid.cc	88.4% <0.0%> (+2.0%)	⬆️
src/tools/csg_stat.cc	100.0% <0.0%> (+2.2%)	⬆️
src/libcsg/csgapplication.cc	72.9% <0.0%> (+3.0%)	⬆️
include/votca/csg/bead.h	4.6% <0.0%> (+3.1%)	⬆️
... and 8 more

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