New mirror provided by AG DSN

Hello,

AG DSN would like to provide a F-Droid mirror.

• reachable via IPv4 only with rsync, https, http
• repo: https://ftp.agdsn.de/fdroid/repo/
• archive: https://ftp.agdsn.de/fdroid/archive/
• status: https://status.agdsn.net/ (Mirror)
• Syncs twice a day from https://ftp.fau.de/. receives push rsync from f-droid.org
• 10G 20G connection located in Dresden.

/cc @Paktosan