Fixes #10416 Followup to a hardcoded string in [gitea#17743](https://github.com/go-gitea/gitea/pull/17743) * instead of using a hardcoded namespace, use the configured application domain * `ssh-keygen` refuses to work with empty namespace, but `Domain` falls back to `localhost`: https://codeberg.org/forgejo/forgejo/src/commit/95dca7ff57955f5a08e656caf8ceb61c88201ff8/modules/setting/server.go#L192 * since `VerifySSHKey` verifies the namespace, I think that using a mostly-unique string instead of a hardcoded one doesn't hurt. Here's what `man ssh-keygen` says on the topic: > An additional signature namespace, used to prevent signature confusion across different domains of use (e.g. file signing vs email signing) must be provided via the -n flag. Namespaces are arbitrary strings, and may include: “file” for file signing, “email” for email signing. For custom uses, it is recommended to use names following a NAMESPACE@YOUR.DOMAIN pattern to generate unambiguous namespaces. ## Testing There's a test `TestFromOpenSSH` but it uses a hardcoded default namespace `file`: https://codeberg.org/forgejo/forgejo/src/commit/95dca7ff57955f5a08e656caf8ceb61c88201ff8/models/asymkey/ssh_key_test.go#L334 Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/10429 Reviewed-by: Beowulf <beowulf@beocode.eu> Reviewed-by: Gusted <gusted@noreply.codeberg.org> Co-authored-by: 0ko <0ko@noreply.codeberg.org> Co-committed-by: 0ko <0ko@noreply.codeberg.org>