Restore --with-new-pkgs arg in CI Dockerfile

[sea-bass]

Description

Trying to piece together why humble CI started randomly failing...

Checklist

• Required by CI: Code is auto formatted using clang-format
• Extend the tutorials / documentation reference
• Document API changes relevant to the user in the MIGRATION.md notes
• Create tests, which fail without this PR reference
• Include a screenshot if changing a GUI
• While waiting for someone to review your request, please help review another open pull request to support the maintainers

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.70%. Comparing base (94a68c8) to head (c64ee59).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3129      +/-   ##
==========================================
- Coverage   46.00%   45.70%   -0.30%     
==========================================
  Files         483      482       -1     
  Lines       40632    40432     -200     
==========================================
- Hits        18690    18476     -214     
- Misses      21942    21956      +14     

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