Create dotnet-core-desktop.yml

[scubamut]

What does this implement/fix? Explain your changes.

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Does this close any currently open issues?

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Any other comments?

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Checklist

Check all those that are applicable and complete.

• Make sure to include one or more tests for your change
• If an enhancement PR, please create docs and at best an example
• Add yourself to AUTHORS
• Updated the CHANGELOG

[codecov-commenter]

Codecov Report

Merging #46 into master will decrease coverage by 5.75%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #46 +/- ## ========================================== - Coverage 69.42% 63.66% -5.76%  ========================================== Files 1 1 Lines 278 278 ========================================== - Hits 193 177 -16 - Misses 85 101 +16 

Flag	Coverage Δ
#setup_linux	63.66% <ø> (-5.76%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
setup.py	63.66% <0.00%> (-5.76%)	⬇️

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[scubamut]

sorry, I made a mistake.