Fix missing package path in dotnet nuget push

[Copilot]

dotnet nuget push was invoked without a package path, causing the publish workflow to fail with "Required argument missing for command: 'push'". The package filename includes a dynamic version, so it can't be hardcoded.

Changes

• build-and-publish.yml
  • dotnet pack: added --configuration Release --output ./artifacts to emit the .nupkg to a known directory
  • dotnet nuget push: added ./artifacts/*.nupkg as the package argument (handles dynamic version in filename) and explicit --source https://api.nuget.org/v3/index.json

- name: Package
  run: dotnet pack --no-build --configuration Release --output ./artifacts
- name: Publish NuGet
  run: dotnet nuget push ./artifacts/*.nupkg --api-key ${{secrets.NUGET_API_KEY}} --source https://api.nuget.org/v3/index.json

Original prompt

---

This section details on the original issue you should resolve

<issue_title>build and publish: missing argument for command 'push'</issue_title>
<issue_description>The workflow builds and packs the nuget package, but the push command doesn't specifiy the package.
Package is in bin/release/Net.Code.Csv.[version].nupkg
Problem is this contains the version which is dynamic.

Run dotnet nuget push --api-key ***
Required argument missing for command: 'push'.

error: Please specify the path to the package.
Error: Process completed with exit code 1.
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes build and publish: missing argument for command 'push' #8

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