add sphinx-copybutton extension

[shahzebsiddiqui]

No description provided.

[codecov]

Codecov Report

Merging #973 (50f573c) into devel (484297d) will increase coverage by 3.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            devel     #973      +/-   ##
==========================================
+ Coverage   74.82%   77.89%   +3.07%     
==========================================
  Files          43       43              
  Lines        5044     5044              
  Branches      907      907              
==========================================
+ Hits         3774     3929     +155     
+ Misses       1081      922     -159     
- Partials      189      193       +4     

Impacted Files	Coverage Δ
buildtest/buildsystem/base.py	68.43% <0.00%> (+1.55%)	⬆️
buildtest/executors/setup.py	78.85% <0.00%> (+2.88%)	⬆️
buildtest/config.py	55.00% <0.00%> (+3.00%)	⬆️
buildtest/buildsystem/builders.py	74.38% <0.00%> (+5.00%)	⬆️
buildtest/buildsystem/scriptbuilder.py	82.46% <0.00%> (+5.26%)	⬆️
buildtest/cli/compilers.py	68.03% <0.00%> (+8.20%)	⬆️
buildtest/system.py	74.35% <0.00%> (+18.32%)	⬆️
buildtest/executors/slurm.py	77.78% <0.00%> (+54.25%)	⬆️

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