That link leads to 404 now, and the one that seems to be a “live” variant of the previous - https://docs.gitea.com/usage/packages/debian - does not contain instructions for uploading one’s own PGP key to be used for signing packages. And by default the Debian packages registry uses some auto-generated(?) key, as it seems.
The Gitea’s web GUI also does not provide instructions for setting a custom PGP key for signing .deb packages.
It may already be documented somewhere, but unfortunately I couldn’t find it. Can someone please point me to the right place? I’d be totally fine with not having it in the GUI, a bare cURL upload of the .asc is no problem for me, but I just don’t know what is the uploading route/URL (if there is one at all).