Bring git ignored file into GH pages

[pingu2k4]

Hey,
I feel this might be similar to #1116 sorry...
I have a pre-build step which compiles some JS files into an index.bundle.js file, which I don't want kept in source control. Its bulky, and is only something I really want to be there when I build. If I use this action with the file ignored, it will not come across to GH pages and will be missing.
I've tried, as #1116 mentioned, to delete my .gitignore file prior to calling this action, but there was no success with that. Is there any way to keep the file outside of source control, to build the project (and hence generate it) within GH actions prior to this action, and have this action take it over to the GH pages?