fix path

Author: newbe36524

.github/workflows/release_nuget.yml

@@ -32,5 +32,5 @@ jobs:
 
       - name: Push nuget package to nuget.org registry
         run: |
-          cd $GITHUB_WORKSPACE/src
+          cd $ENV:GITHUB_WORKSPACE/src
           dotnet nuget push **/*.nupkg --api-key ${{ secrets.NUGET_TOKEN }} --no-symbols --skip-duplicate --source https://api.nuget.org/v3/index.json