Same perl replacement as https://github.com/go-gitea/gitea/pull/25686 but for 1.20 to ease future backporting.
This PR adds a [CRAN](https://cran.r-project.org/) package registry. ![grafik](https://user-images.githubusercontent.com/1666336/210450039-d6fa6f77-20cd-4741-89a8-1624def267f7.png)