Add steps to install uv in venv

[FranArenas]

Description

uv is needed to use the make file for development, but uv is not installed in the venv and there is not a command to activate the venv.

This PR adds the sh command to activate the venv and the command to install uv before executing the Makefile.

[github-actions]

ACTION NEEDED

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[ion-elgreco]

UV should actually be installed globally, I would just put a link to the UV installation for this

[FranArenas]

UV should actually be installed globally, I would just put a link to the UV installation for this

Makes sense, I just added the link to the uv repo and warned about the need of the tool.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.32%. Comparing base (72311ed) to head (cfe6cb1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3085      +/-   ##
==========================================
+ Coverage   72.29%   72.32%   +0.03%     
==========================================
  Files         128      128              
  Lines       41165    41165              
  Branches    41165    41165              
==========================================
+ Hits        29761    29774      +13     
  Misses       9492     9492              
+ Partials     1912     1899      -13     

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