Downloading: http://repo.aptly.info/system-tests/pkg.jenkins.io/debian-stable/binary/InRelease
Error (retrying): HTTP code 404 while fetching http://repo.aptly.info/system-tests/pkg.jenkins.io/debian-stable/binary/InRelease
Retrying 0 http://repo.aptly.info/system-tests/pkg.jenkins.io/debian-stable/binary/InRelease...
Download Error: http://repo.aptly.info/system-tests/pkg.jenkins.io/debian-stable/binary/InRelease
Downloading: http://repo.aptly.info/system-tests/pkg.jenkins.io/debian-stable/binary/Release
Downloading: http://repo.aptly.info/system-tests/pkg.jenkins.io/debian-stable/binary/Release.gpg
gpgv: Signature made Wed Dec 13 17:19:55 2023 UTC
gpgv:                using RSA key 63667EE74BBA1F0A08A698725BA31D57EF5975CA
gpgv: Good signature from "Jenkins Project <jenkinsci-board@googlegroups.com>"

Mirror [mirror21]: http://repo.aptly.info/system-tests/pkg.jenkins.io/debian-stable/ ./binary/ successfully added.
You can run 'aptly mirror update mirror21' to download repository contents.