Login isn’t necessary, but there is no :latest
tag published so you need to pull a version that exists. The current version is at codeberg.org/forgejo/forgejo:1.21.8-0
or at :1.21
if you want one that tracks patch updates (as found in the container registry).
View -> User Interface, change to Tabbed or Tabbed Compact (or Notebookbar in old versions).