CI: skip duplicates during nuget push

Author: PawelGerr

.github/workflows/main.yml

@@ -100,7 +100,7 @@ jobs:
         if: startsWith(github.ref, 'refs/tags/')
         run: |
           cd out
-          dotnet nuget push "*.nupkg" -k "$env:API_KEY"
+          dotnet nuget push "*.nupkg" -k "$env:API_KEY" --skip-duplicate
         shell: pwsh
         env:
           API_KEY: ${{ secrets.NUGET_ORG_API_KEY }}