METK-136: add category: sink

[mcakircali]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 42.85714% with 8 lines in your changes missing coverage. Please review.

Please upload report for BASE (develop@25e0ea4). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/metkit/mars/MarsLanguage.cc	42.85%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop      #94   +/-   ##
==========================================
  Coverage           ?   66.96%           
==========================================
  Files              ?      123           
  Lines              ?     7275           
  Branches           ?      721           
==========================================
  Hits               ?     4872           
  Misses             ?     2403           
  Partials           ?        0           

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[github-actions]

Private downstream CI failed.
Workflow name: private-downstream-ci-hpc
View the logs at https://github.com/ecmwf/private-downstream-ci/actions/runs/15777761105.

[github-actions]

Private downstream CI failed.
Workflow name: private-downstream-ci
View the logs at https://github.com/ecmwf/private-downstream-ci/actions/runs/15778085944.