[publish] Actually include nuget api key

Author: SamboyCoding

.github/workflows/default.yml

@@ -27,4 +27,6 @@ jobs:
                     path: Fmod5Sharp/bin/Release/*.nupkg
             -   name: Upload to NuGet
                 if: contains(github.event.head_commit.message, '[publish]') == true
+                env:
+                    NUGET_API_KEY: ${{ secrets.NUGET_API_KEY }}
                 run: dotnet nuget push ./Fmod5Sharp/bin/Release/*.nupkg -s https://api.nuget.org/v3/index.json -k $NUGET_API_KEY