Following the creation of the changelog via `git-sv`, the release process can also be simplified.
The new approach only requires to call `git sv tag` from a Maintainer with write access to the repo.
This will create and push the tag.
The release notes and subsequent Gitea release will then be created by the new workflow job.
Reviewed-on: https://gitea.com/gitea/helm-gitea/pulls/865
Co-authored-by: pat-s <patrick.schratz@gmail.com>
Co-committed-by: pat-s <patrick.schratz@gmail.com>
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