Play nicely with github release feature

[mikehale]

I'd like to be able to create releases with https://docs.github.com/en/repositories/releasing-projects-on-github/managing-releases-in-a-repository#creating-a-release.

However both this action, and the github feature expect to be the one to create the tag, which means they can't currently work together.

[segiddins]

The default bundler release task should already be resilient to the tag existing