fix docfx build

[WeihanLi]

use dotnet build -c Release for the build step

action run: https://github.com/WeihanLi/kubernetes-client-csharp/actions/runs/8074136853

[WeihanLi]

no idea why this diff, seemed no changes, just updated the following build

[tg123]

not due to docfx?
last time i checked the pipeline, it was caused by net6 not supported

[tg123]

/LGTM

[k8s-ci-robot]

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This pull-request has been approved by: tg123, WeihanLi

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[WeihanLi]

not due to docfx?

Seeing this warning, tried with -c Release

https://github.com/kubernetes-client/csharp/actions/runs/8064137407/job/22027395641

[codecov-commenter]

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Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1529   +/-   ##
=========================================
  Coverage          ?   62.07%           
=========================================
  Files             ?      102           
  Lines             ?     3014           
  Branches          ?      636           
=========================================
  Hits              ?     1871           
  Misses            ?     1143           
  Partials          ?        0           

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