Fix system-tests CI flakiness by adding Dockerhub login

[vpellan]

What does this PR do?
Fix system-tests CI flakiness by adding Dockerhub login

Motivation:

Docker has a rate limit based on your IP when you docker pull without being logged. This limit is pretty low. If you make the same command, but being authenticated before, the rate limit docker applies is way higher.

Change log entry
None.

Additional Notes:
Variables added as repository secrets.

How to test the change?
I suppose that you could launch system-tests GH workflow a lot of time and see that it does not fail because of dockerhub rate limit

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.77%. Comparing base (ce1a178) to head (a034184).
Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4119      +/-   ##
==========================================
- Coverage   97.77%   97.77%   -0.01%     
==========================================
  Files        1350     1350              
  Lines       81077    81150      +73     
  Branches     4085     4087       +2     
==========================================
+ Hits        79275    79344      +69     
- Misses       1802     1806       +4     

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[pr-commenter]

Benchmarks

Benchmark execution time: 2024-11-15 15:05:38

Comparing candidate commit a034184 in PR branch vpellan/ci-docker-login with baseline commit 6f4db56 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 29 metrics, 2 unstable metrics.