Always push to GitHub Packages; gate NuGet.org on release only

[Copilot]

Manual workflow_dispatch runs produced no packages because the entire deploy job was gated on github.event_name == 'release'. The intent is to always publish pre-release packages to GitHub Packages, while keeping NuGet.org pushes release-only.

Changes

• publish.yml: Removed if: github.event_name == 'release' from the deploy job level; moved it down to the NuGet.org publish step only.

deploy:
  runs-on: ubuntu-latest        # no job-level condition; always runs
  needs: [ build ]
  steps:
    - name: Publish GitHub package
      run: dotnet nuget push ...  # always pushes (pre-release on manual runs)

    - name: Publish NuGet package
      if: github.event_name == 'release'   # NuGet.org only on release
      run: dotnet nuget push ...

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[Copilot]

Pull request overview

This PR restructures the deploy job in the publish workflow so that the GitHub Packages feed is always updated (on every push to main, release, or manual dispatch), while publishing to NuGet.org remains gated behind a GitHub release event.

Changes:

• Removed the if: github.event_name == 'release' condition from the deploy job level so the job always runs.
• Added the if: github.event_name == 'release' condition specifically to the "Publish NuGet package" step (NuGet.org), keeping the "Publish GitHub package" step unconditional.

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[iwillspeak]

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