test: Add PVS studio docker run.

[iphydf]

Can't run this on github, yet. I'll add the license key later and run it as post-submit.

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This change is 

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 73.77%. Comparing base (969e3a2) to head (9278203).
Report is 109 commits behind head on master.

Files with missing lines	Patch %	Lines
toxcore/crypto_core_test_util.cc	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2669      +/-   ##
==========================================
+ Coverage   73.76%   73.77%   +0.01%     
==========================================
  Files         148      148              
  Lines       30479    30479              
==========================================
+ Hits        22482    22487       +5     
+ Misses       7997     7992       -5     

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