add(task): Allow editing environment variables

[Nukesor]

Fixes #503

[codecov]

Codecov Report

Attention: Patch coverage is 64.19753% with 29 lines in your changes missing coverage. Please review.

Project coverage is 79.57%. Comparing base (8cc7893) to head (161dc10).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pueue/src/client/client.rs	60.97%	16 Missing ⚠️
pueue/src/daemon/network/message_handler/env.rs	75.00%	8 Missing ⚠️
pueue/src/client/cli.rs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #584      +/-   ##
==========================================
+ Coverage   79.41%   79.57%   +0.15%     
==========================================
  Files          73       74       +1     
  Lines        5928     5974      +46     
==========================================
+ Hits         4708     4754      +46     
  Misses       1220     1220              

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