Added NuGet publish (#14)

Author: csharpfritz

.github/workflows/build.yaml

@@ -11,6 +11,7 @@ on:
   pull_request:
     branches:
       - main
+      - release
     paths-ignore:
       - '**/*.md'
       - '**/*.gitignore'
@@ -74,8 +75,12 @@ jobs:
         echo "PKG_VERSION=$version" | Out-File -FilePath $Env:GITHUB_ENV -Encoding utf-8 -Append
         echo "RELNOTES=$relnotes" | Out-File -FilePath $Env:GITHUB_ENV -Encoding utf-8 -Append
 
+    - name: Push to NuGet
+      if: ${{ github.ref == 'refs/heads/release' }}
+      run: dotnet nuget push **/*.nupkg -k ${{ secrets.NUGET_API_KEY }} -s https://api.nuget.org/v3/index.json --skip-duplicate
+
     - name: Tag and Release
-      if: ${{ github.event_name != 'pull_request' }}
+      if: ${{ github.ref == 'refs/heads/release' && github.event_name != 'pull_request' }}
       id: tag_release
       uses: softprops/action-gh-release@v0.1.13
       with: