[CI]: Disable FSL installation for junifer-ci Docker image

[synchon]

• description of feature/fix
• tests added/passed
• add an entry for the latest changes

This PR disabled FSL installation for junifer-ci build as standard GitHub Runner runs out of space.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.67%. Comparing base (98df4b6) to head (f267849).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #467   +/-   ##
=======================================
  Coverage   91.67%   91.67%           
=======================================
  Files         146      146           
  Lines        6019     6019           
  Branches      962      962           
=======================================
  Hits         5518     5518           
  Misses        324      324           
  Partials      177      177           

Flag	Coverage Δ
docs	100.00% <ø> (ø)

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