enh(dev): Commit pixi.lock file

[hoxbro]

Description

Add pixi.lock, this should end up working with our existing infrastructure and harden our CI.

Needs to update dev documentation and also likely some actions to work with it.

Checklist

• Pull request title follows the conventional format
• Tests added and are passing
• Added documentation

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.22%. Comparing base (1e35295) to head (9aba2ba).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6888   +/-   ##
=======================================
  Coverage   89.22%   89.22%           
=======================================
  Files         340      340           
  Lines       74038    74039    +1     
=======================================
+ Hits        66060    66063    +3     
+ Misses       7978     7976    -2     

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