ci: fix artifact path

Author: Tarmil

.github/workflows/build.yml

@@ -81,7 +81,7 @@ jobs:
           name: nupkg
       - name: Push to GitHub Feed
         run: |
-          for f in ./nupkg/*.nupkg
+          for f in *.nupkg
           do
             curl -vX PUT -u "$GITHUB_USER:$GITHUB_TOKEN" -F package=@$f $GITHUB_FEED
           done