Introduce UV to replace Pipenv; multi-stage Dockerfile (new PR)

[dmannarino]

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• Make sure you are requesting to pull a topic/feature/bugfix branch (right side). Don't request your master!
• Make sure you are making a pull request against the develop branch (left side). Also you should start your branch off our develop.
• Check the commit's or even all commits' message styles matches our requested structure.
• Check your code additions will fail neither code linting checks nor unit test.

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Using pipenv

Issue Number: N/A

What is the new behavior?

Pipenv replaced with uv

Does this introduce a breaking change?

• Yes
• No

Other information

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 43 lines in your changes missing coverage. Please review.

Project coverage is 79.35%. Comparing base (8af1960) to head (bfbcf83).

Files with missing lines	Patch %	Lines
app/settings/gunicorn_conf.py	0.00%	43 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #624      +/-   ##
===========================================
- Coverage    79.91%   79.35%   -0.56%     
===========================================
  Files          133      134       +1     
  Lines         6129     6172      +43     
===========================================
  Hits          4898     4898              
- Misses        1231     1274      +43     

Flag	Coverage Δ
unittests	79.35% <0.00%> (-0.56%)	⬇️

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