Chore/improve examples

[tamirse]

• Added environment variables to container deployment example
• Updated examples image from 'fastai' to 'ubuntu-24.04-cuda-12.8-open-docker'
• Consistent naming and load of credentials from env variables in examples

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.66%. Comparing base (a5edb66) to head (bf62238).
Report is 16 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
+ Coverage   98.57%   98.66%   +0.09%     
==========================================
  Files          19       19              
  Lines         980      977       -3     
==========================================
- Hits          966      964       -2     
+ Misses         14       13       -1     

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