doc: update kiwi container build URL

[akhilerm]

• Update the KIWI container image building URL as the current URL gives 404

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.68%. Comparing base (36a1d10) to head (f2d85a7).
Report is 48 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #596      +/-   ##
==========================================
+ Coverage   72.58%   73.68%   +1.10%     
==========================================
  Files          68       69       +1     
  Lines        5424     5556     +132     
==========================================
+ Hits         3937     4094     +157     
+ Misses       1104     1074      -30     
- Partials      383      388       +5     

see 11 files with indirect coverage changes

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[cyphar]

LGTM, thanks!