Fixed docker login in build and self-tests to take place before any docker operations.

[AlexSkrypnyk]

This will help to avoid rate limits during the consumer site tests and during Vortex self-tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.75%. Comparing base (8828dda) to head (d21438d).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #1578       +/-   ##
============================================
+ Coverage    57.74%   68.75%   +11.01%     
============================================
  Files           79       79               
  Lines         4532     4532               
============================================
+ Hits          2617     3116      +499     
+ Misses        1915     1416      -499     

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