Migrate bsp-geth build docker images from GCR to GAR

[noslav]

• GCR deprecated in favour of default GAR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.34%. Comparing base (e82ed55) to head (276fc67).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #196      +/-   ##
===========================================
+ Coverage    57.29%   57.34%   +0.04%     
===========================================
  Files          600      600              
  Lines        80100    80100              
===========================================
+ Hits         45896    45934      +38     
+ Misses       30330    30295      -35     
+ Partials      3874     3871       -3     

see 17 files with indirect coverage changes

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