[Bugfix] argilla server: allow define workspace for argilla server image

[frascuchon]

Description

Closes #5505

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Documentation update

How Has This Been Tested

Checklist

• I added relevant documentation
• I followed the style guidelines of this project
• I did a self-review of my code
• I made corresponding changes to the documentation
• I confirm My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have added relevant notes to the CHANGELOG.md file (See https://keepachangelog.com/)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.10%. Comparing base (63d620d) to head (4d17fd4).
Report is 24 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5517      +/-   ##
===========================================
- Coverage    91.12%   91.10%   -0.02%     
===========================================
  Files          145      145              
  Lines         5939     5939              
===========================================
- Hits          5412     5411       -1     
- Misses         527      528       +1     

Flag	Coverage Δ
argilla-server	91.10% <ø> (-0.02%)	⬇️

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