fix(scripts): Use the default image root when running Docker

[sschuberth]

Use the same image root that docker_build.sh uses by default.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.05%. Comparing base (81f58ea) to head (a0f2a8a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #9624   +/-   ##
=========================================
  Coverage     68.05%   68.05%           
  Complexity     1285     1285           
=========================================
  Files           249      249           
  Lines          8835     8835           
  Branches        921      921           
=========================================
  Hits           6013     6013           
  Misses         2433     2433           
  Partials        389      389           

Flag	Coverage Δ
funTest-docker	65.14% <ø> (ø)
funTest-non-docker	33.31% <ø> (ø)
test-ubuntu-24.04	35.84% <ø> (ø)
test-windows-2022	35.82% <ø> (ø)

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