Push to MyGet from rel/* branches

Fix packages not being pushed to MyGet from rel/* branches.

Author: martincostello

.github/workflows/build.yml

@@ -88,7 +88,7 @@ jobs:
 
     - name: Push NuGet packages to aspnet-contrib MyGet
       run: dotnet nuget push "artifacts\packages\Release\Shipping\*.nupkg" --api-key ${{ secrets.MYGET_API_KEY }} --skip-duplicate --source https://www.myget.org/F/aspnet-contrib/ --symbol-source https://www.myget.org/F/aspnet-contrib/
-      if: ${{ github.repository_owner == 'aspnet-contrib' && (github.ref == 'refs/heads/dev' || startsWith(github.ref, 'refs/tags/')) && runner.os == 'Windows' }}
+      if: ${{ github.repository_owner == 'aspnet-contrib' && (github.ref == 'refs/heads/dev' || startsWith(github.ref, 'refs/heads/rel/') || startsWith(github.ref, 'refs/tags/')) && runner.os == 'Windows' }}
 
     - name: Push NuGet packages to NuGet.org
       run: dotnet nuget push "artifacts\packages\Release\Shipping\*.nupkg" --api-key ${{ secrets.NUGET_API_KEY }} --skip-duplicate --source https://api.nuget.org/v3/index.json