**Backport**: https://codeberg.org/forgejo/forgejo/pulls/6573
So that it does not use docker.io
(cherry picked from commit 69ce414f7e39559a804c9fd23b25146f7b281250)
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/6574
Reviewed-by: Michael Kriese <michael.kriese@gmx.de>
Co-authored-by: Earl Warren <contact@earl-warren.org>
Co-committed-by: Earl Warren <contact@earl-warren.org>