Releases are not imported with Gitea Importer
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### Description
Now that Gitea has support for [Release Assets](https://github.com/go-gitea/gitea/pull/673) and has a [Release API](https://github.com/go-gitea/gitea/pull/510) it makes a lot more sense to import releases now. Unfortunately Assets can't be fetched over the API [yet](https://github.com/go-gitea/gitea/issues/711) so might want to wait for that one to get fixed first :slight_smile:
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