Incompatible with immutable releases

[jkroepke]

Hi, I recently enabled immutable releases and encounter an error on my next release:

Run softprops/action-gh-release@72f2c25fcb47643c292f7107632f7a47c1df5cd8
👩‍🏭 Creating new GitHub release for tag v4.6.7...
⬆️ Uploading helm-secrets.tar.gz...
Error: Cannot upload assets to an immutable release. - https://docs.github.com/rest

I guess the release must be created as a draft first, then the files need to be attached, and only after that can the release be published.