add credentials into staging

[NVMakarenko]

dev

Project

• [Sign in] via Google account

Code reviewers

• @loqimean

Summary of issue

Admin could sign in via Google account.

Summary of change

Add credentials

CHECK LIST

• СI passed
• Сode coverage >=95%
• PR is reviewed manually again (to make sure you have 100% ready code)
• All reviewers agreed to merge the PR
• I've checked new feature as logged in and logged out user if needed
• PR meets all conventions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.82%. Comparing base (9ced7ad) to head (57dde9b).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1000   +/-   ##
========================================
  Coverage    91.82%   91.82%           
========================================
  Files           74       74           
  Lines         1052     1052           
========================================
  Hits           966      966           
  Misses          86       86           

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