Create GitHub releases on Nuget package push

[nojaf]

It still heavily annoys me that we don't make GitHub release when we publish NuGet packages.

Two key reasons to have them:

• People can subscribe in GitHub to releases only and be notified when newer releases dropped.
• Dependabot will show the changes from the release notes when it makes PRs.Example PR: Bump fsdocs-tool from 22.0.0 to 22.2.0 fsharp/fsharp-compiler-docs#1017 , having a GitHub release would populate this.