Update workflow to publish to nuget.org on tags

Author: nullforce

.github/workflows/build.yml

@@ -66,7 +66,7 @@ jobs:
       run: dotnet nuget push ./*.nupkg --api-key ${{ secrets.GITHUB_TOKEN }} --source https://nuget.pkg.github.com/${{ github.repository_owner }}/index.json
 
   publish-nuget-org:
-    if: github.ref_name == 'main'
+    if: github.ref_name == 'main' || startsWith(github.ref, 'refs/tags/')
     runs-on: ubuntu-latest
     needs: [build, publish-github-package]
     steps: